Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4c5d4467f4dddf…

MALICIOUS

PDF

83.6 KB Created: 2021-08-20 18:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 763b59d81daa4e3ddcdc6003ea687430 SHA-1: b406d3c8270f6abb6719b01481b59e3dd7658ed5 SHA-256: 7a4c5d4467f4dddf47f9592be88c23a16d086c6eb9911e5bd24d3dfc22164adb
264 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It presents a fake download button and a lure for password-protected archives, suggesting it's designed to trick users into downloading malware. The document also includes numerous links to potentially compromised websites, likely serving as a distribution point for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 https://ketchas.ru/uplcv?utm_term=how+can+i+get+e+registration+in+poea PDF link annotation
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ttn7ajum5v1p5p961aad928kg/ziluxiwedexoworapipoz.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/57757778363.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/sijisuwozusirokesurepela.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5454051841---40222618266.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea5143505---36760591952.pdfIn PDF document text
    • https://advik.net/userfiles/file/pasusaneser.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/tokufofukakija.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/79356760749.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/76370992538.pdfIn PDF document text
    • http://orem.mn/uploads/files/81686233834.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/75252737462.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/26juqrbbhlcdnkql3mpbcn30m3/nawexa.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62355191885.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210607_5A353F698EAE9737.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6709de71---woguwiwetoju.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xululenurixozutelumu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a07ac7b71---tusomibu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9df3b43d---33195884113.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/eac24e0845d9fc06dd2964ce7dfde72e/rifirivogobemixazurato.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/45600845888.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082120c0f8d9---siwemikepaberadiwikotojus.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8118d58d2f0d04f41aa2a9e48b27b945/12093357895.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff06b2bdf7---fenadajofomaja.pdfIn PDF document text
    • 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_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 10580 bytes
SHA-256: d49a1fc338f0a695ef7867e643ae4b57a071f0cadf5706b75a68d64e8efd7c55
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 17240 bytes
SHA-256: 6af6000d37ed127bddec6f7988ec6a0fea83d47edb6559e3857b7d1198548ec0
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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