Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d9b42af7ea8f94…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 02:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef23117cee88874a982d987ff4cc9189 SHA-1: 4b1eb8d1b14298907a2169225438463b7251b7c4 SHA-256: c2d9b42af7ea8f94db93f67e10d13a391f321cc71136f829a8cb8b26b8919a46
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=english+grammar+lessons+tenses+pdf PDF link annotation
    • https://aashianarealty.com/file/migezafuvem.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/lirutaliroju.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/74945712999.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210610143344.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160854742cd93f---70921126026.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/75962274768.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/mebonidagiziwakejut.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fkk2qvv0mjbb8ies3lpvqssh1h/dejapofalel.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/23nj6loh7g7pd48627su8qb6pi/88899485319.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b97e2607867da93506ed36dbc8175d89/fepanivotobal.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/84454253309.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/75050731464.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2637aa27db8831c4e2a8bc6477b88466/16095836403.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/53479816027.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/nubokolejo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/f32f2a68647c4082aab1d51fbcf8fa1b/domigeb.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/39000866944.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5f431d8b7---65943630619.pdfIn PDF document text
    • https://tch.lu/files/files/vovirefinemu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd8d2bc28---66507796459.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rse5rcqukgma5kotbrj0h608u3/paxizizuvanejedokorabul.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16074ccb702f8c---vonukegurimoluneb.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/68446534738.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_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 17684 bytes
SHA-256: 72a4624fd0ecdda4426142a8d0ae8ca572d91d7618146c2e165e771dcba8ea71
font_02_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 10928 bytes
SHA-256: f27bbe56cef9019f98a9e59440b0494531d5c59b1b7bca1caa9dedf6ee583c58

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