Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c76cd2c20a4222…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 07:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 774d136d6bc3d12eb6999ec9e24285c2 SHA-1: d7377d3fb42d2c6e86b5c9f5426624c9cb6dba1b SHA-256: 36c76cd2c20a4222d1b6cb1df4b2c696e470feb53971ffdbbae3b7953f48564b
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links to potentially compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute malware. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to evade gateway security. The document body is heavily obfuscated, but the heuristics strongly suggest a malicious download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5091d38d---pisesemuxa.pdf In PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/u7ha31pmd7lag2bosfn2nne8pa/10959672904.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/2733807657.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6b17880e795d4de0b84eaef27f128e84/minamikara.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/pixiv.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845b19281db---pexaxow.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/lidejiwo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071034b48e6d---dupodapadidexadozizepu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d7e41acd---11350956572.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/ielklvfsmot06l647hibjjfao4/diran.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/30937837430.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cfe670fb---donajufujaxaxaloj.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ueurp2tfbemvap6edpeafpi173/18796557722.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8caaf2b83c---zumawutuvutu.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/37021331938.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72a831302b---10265275735.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/32605100258.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/wekufifanepokoz.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/281dbavtrnsvsa60mgdatn1knf/wujibumifen.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/96620305690.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a29b376fd4---70043431903.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/60716421189.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/fijimaveregujolu.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0d9e2deb048f7eef9a815464757c40df/28928702817.pdfIn PDF document text
    • https://baglab.pl/galeria/file/pamilararalivosisi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/taniwuxikefofoxijis.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/62d3980da7f50c28ed96b8bcd88e0833/58889567857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=thinking+in+java+book+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 17464 bytes
SHA-256: f41f89cbdad32952cb6548e4cc746eacf3ef2a00dc7d008f379fc8b5a8b43c3c
font_01_sfnt_off000128b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D0 10988 bytes
SHA-256: 3b68acbb5423c05b8c3dbf947be38e975a931e4b4dbd70132a942ee6259db9c1

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