Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e08de97bdee4a9…

MALICIOUS

PDF

69.1 KB Created: 2021-09-02 13:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 749a48d4feeb30bb396399546111f196 SHA-1: 261e8fb37ed2b344a80f38dad3c3f8b1135f6bca SHA-256: f6e08de97bdee4a9a0cb7b1a99ae77f8ee2d556e47bfc57dfb6a35167e87ab2d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are identified as compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://cwesp.biz/upload/file/60110722350.pdf In PDF document text
    • http://contelex.it/userfiles/files/koxagebowal.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/bonagubumepudu.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/bamurizazogusuvu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ada3e7f4fb---xotetivezodovuganixidiwom.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7vpurje31uqv51v8gh6vpph1sb/98683102487.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/lazumaf.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e6ae57168---zidowotukejojitenitoz.pdfIn PDF document text
    • https://bliznacite.com/files/1855248395.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/63240311792.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ige3h4md8imj9p4qr6se011lj1/kebuzaxid.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/tajor.pdfIn PDF document text
    • http://wamer.org/userfiles/file/fusabuxowe.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/wudobilotegavuvoki.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-18/20210718015005717763.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/96300195549.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/51446555738.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/89090047551.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e7ca283b94dd15309addebe0079db60/pikabupejakudusu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611468c36a1bf---79008619239.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/fenaxuzazut.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/27846570291.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/638n0d6l53nobfji7okhd61e9d/34183152403.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/69114386659.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/11295572361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=defence+day+poetry+in+urdu+pdfPDF 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_off0000b1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E3 14492 bytes
SHA-256: 01f69f503e9b64a1e3c29d9ca1cc7c3bb8a5f76655953546ab9fa979b073ae8d
font_01_sfnt_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10616 bytes
SHA-256: 40da3295b8790ddef8cf217dd999f7c30a88ea761200ea474ce130a6a87d7695
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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