Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e90d1af182ed34…

MALICIOUS

PDF

82.7 KB Created: 2021-08-01 03:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5205bfdcd59cd7a36e159ac25099d352 SHA-1: 00165bd41dde65c8b9f4578eec31b7e63906fccf SHA-256: a6e90d1af182ed340e19b00475399b5b9d019bedaa67d94b7fb709f3f9452284
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a phishing trojan indicate a likely intent to lure users into a compromised environment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9209738af6---varofudupujeripedawu.pdf In PDF document text
    • https://binarbaid.com/public_html/userfiles/file/puboxeb.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf31a2379b---fulan.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/04q46as8bs4p9stq7fee56abqr/83670138920.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/40823271554.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/39707985683.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b516ba09459---figenox.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rt8arfs0gdn10tqear4pnii3pt/tefirobuxawizojujoboxos.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f05c570f3---wipojivizaduto.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/zatetuku.pdfIn PDF document text
    • http://centronegozi.com/public/ritagavabu.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/61932110170.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/07d58722de809a6d5d40064876efbcf7/53275474467.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ftn9cgh9lbut44p5o7668k0os7/lumisuditiwaxominode.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caabb91249a---watobibakuwukat.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/sasufizumofadalegenisuj.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/totodatubibosus.pdfIn PDF document text
    • http://carszana.com/image/upload/File/80590645061.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jsmidce9um4lqhok6fgfe9ghh0/27150649954.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b7b40baa---15900414500.pdfIn PDF document text
    • http://lucann.com/Upload/file/41058878923.pdfIn PDF document text
    • http://grupophi.es/uploads/files/59831767805.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/64t14mvd0dga5moa3t5ppbo7dc/guvolaturagubakabunobebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=horizontal+vertical+and+slant+asymptotes+worksheetPDF 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_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 16672 bytes
SHA-256: f6cddf6f577a6ff19cf8da8610fa71070a7f6314af494eb0ffbc8ad69b9f5cbf
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 11188 bytes
SHA-256: 89919e73e1375fd06d5d7a65a3eec6a14b358a7aad2ee164baaeb0d97ace3e3d
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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