Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf75154a5d674b2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 02:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be768dd014a68012350d3576f19c2a60 SHA-1: e4568e9ada747d53df075634659fe62c4e61ace8 SHA-256: 8cf75154a5d674b22bfb387b1b32d77f547fd4675253fee08de13b5593b93e22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=bingo+bash+free+chips+hack PDF link annotation
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/warugelizexobapusewusel.pdfIn PDF document text
    • https://clove7.com/userfiles/file/16662812638.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a2fbacba8---11823054256.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/garugobatomuvaduzi.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/nixadegodisewukixeku.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-27/20210927004524706741.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/17376585115.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109280517571357.pdfIn PDF document text
    • http://getem.eu/files/file/fijivuv.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa74f98f4a---46235619244.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021910826366520.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/44239583233.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/puwilofipag.pdfIn PDF document text
    • https://tdfstore.it/file/jabedagawunubodifarexama.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/nuvonurolemipol.pdfIn PDF document text
    • http://midospa.com/upload/files/padegakinopunajago.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210914183134.pdfIn PDF document text
    • http://hairandoil.com/uploads/50639549000.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/17a8413aac8872741ceb44be760c130b/69714265293.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/99225220543.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/tejosamanoja.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_off0000b05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 17756 bytes
SHA-256: 865db2543977d9894bcab38957d530006925828da56c31f191b5d900360023b0
font_02_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 10900 bytes
SHA-256: 80f07971aa5d93dbac0821352f61dde77634358edfb36a41a8a1cfe661613453