Malicious PDF — malware analysis report

Static analysis result for SHA-256 350c6d444bd02720…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 11:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65b3502d2c0521b5e109198a7ebdeff5 SHA-1: 7c27ec5737e2fdafb546bd18dadba418bfa01b94 SHA-256: 350c6d444bd027209d6fe0f958469c6e1df5425807491a8066c68f64223d229f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abwingssuffolk1.com/uploads/files/lefizibakas.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e30ec9ee26e8937c46883f9b8b5134f1/66396090558.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/zerexufiratokokete.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/6fe2ff25cb670f7d68d253009719fc15/jemasazo.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/75050799628.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/xinonelagoxosapufe.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608571c2162e8---66941993570.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/87essunh51okj73ddoasd9usj8/51792791142.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/ravatojovetadodusari.pdfIn PDF document text
    • http://ridendo.cz/files/file/92674043739.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/xejojakesezoluboru.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/gikamosekajeruwa.pdfIn PDF document text
    • https://kultmotor.hu/images/files/24575572151.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/tipebi.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/494fdb6564dba18383521f85059a1e4c/megibebefisuz.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/11451973447.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/87173113635.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a6c10a8468d6d054044e24b42d97be76/95978376969.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/84136614955.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6a7e218b---risabufitudavunoko.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/41026720882.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/40076090293.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ed08cbd0b0024b0f05b543bf95677df0/58466160238.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fiziguweragizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bajaj+rouser+rs+200+manualPDF 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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 17936 bytes
SHA-256: ef49798036b3d1cb2c43f4c745bc0cff490ea78232bbbf691af10d6d0fa58a4c
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 10604 bytes
SHA-256: d870aeaf37b4ecb406ff6d3014c15af7de0001e38fa7367cde8afb3238e8130a