Malicious PDF — malware analysis report

Static analysis result for SHA-256 8348ad32a355a932…

MALICIOUS

PDF

77.6 KB Created: 2021-09-22 21:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2e79fec0c093fe24dd04d9b90195ed7 SHA-1: eeb506e33d4022d8aadffc490bb04f8b84e85bf7 SHA-256: 8348ad32a355a93203e24048d5586f7fa673bf826891ff332d66c6ffa0d5c542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the overall structure indicate an attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=kingsman+the+golden+circle+123 PDF link annotation
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161417ff5a0a79---bixurevarigogelek.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/91488224432.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/63205432932.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86472415229.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e686615ba---83706971958.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/87310504541.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/sezawef.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/29387884574.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630713509.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/53216185072.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/xivizudokabebasew.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/duzixeso.pdfIn PDF document text
    • https://basisnomor.com/contents/files/zigewikajujaxirovi.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/zedekenevavotadipuvad.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/58073865282.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/97201243997.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/jowewulanuruj.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/54173266987.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/69001706743.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e2d3eb02b60ac105b2ff8c315a4af08/33125781039.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614966170e25b---dalegimerajuzusebere.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/73119550021.pdfIn PDF document text
    • https://gencatakan.com/upload/file/noniwus.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_off0000c90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 17792 bytes
SHA-256: 0838d6d33f3fa08115c1a9582b7f726873693d3134635aad9f3e17dcec6d7484
font_01_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 11152 bytes
SHA-256: fdd3da5929c3c2256b0ece11c635b0cf857ac37a683af273b31afa2faf64d91a

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