Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6ff610b3300d2a…

MALICIOUS

PDF

74.1 KB Created: 2021-08-30 14:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a38a7c8ae6f9d057daab03f9052d4fb2 SHA-1: acb776ac48e202e4ffe8e21498adfe8caba4bafd SHA-256: 3b6ff610b3300d2a3f2ee85a2c5a3297e6ff7933873634bc8a688359d9e56364
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. The presence of embedded URLs and the link farm structure indicate an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=wow+classic+rogue+talents+pve PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2f120ef595dcbd9f0e9acf2a962dbcc3/52564224597.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/47164456803.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e82857eaa2f8085e897c540be4d9d9f5/77531712790.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837c8457633---54578031955.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/madodofidiwobavedi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adced6d7f10---32583584294.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/53309109673.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/fca15e27838e9a6933460007793028d8/7319506767.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/61154918259.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/62202656714.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/46d3d3b8c53778afdee1afbd97b0a06c/jazus.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/5810110691.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119ffb38cb03---xozujutazu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/30374294942.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/37494579699.pdfIn PDF document text
    • http://lyshiying.com/d/files/ruraxapomenera.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/79789245456.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0n10vmg9fls6d10igasgq5r9q0/lajabenefibenewijidunuzi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e2f61244c---duvavoror.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/42191389557.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bb9816158808d47fb58f76251afd4f1/vapitemevo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a7abea3971---soxuwinod.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/54900538903.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_off0000be9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 10796 bytes
SHA-256: 32bc4ea5c23cd3abb5cc445020abde7b91b72b4c0b88e7af003887bb5557a890
font_02_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 16760 bytes
SHA-256: 4c1a8429aea5d44737ef91f3aaed6c7972f26ce2c41a7222353bb5dca8219e52

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