Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b51fe97fa6b380…

MALICIOUS

PDF

83.1 KB Created: 2021-06-28 05:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed06dd28f5f449e1b2c3793a5d7478ab SHA-1: c7304954b26eb1cff3c61123f8e3e264131653bf SHA-256: e3b51fe97fa6b3804ce21834f469f9b97a056434aa4de8aa5300847b30d03915
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The primary purpose appears to be directing users to malicious content through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=plural+do+or+does
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d74ea4098b31397b8dc7477d99991737/wemipaxixul.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ff80b03c---56580740742.pdf
    • http://mea-travel.pl/userfiles/file/52993670761.pdf
    • http://msamericapageant.com/clients/873634/File/10903310090.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uhqa3bkf2gtj94mufb8br9uk3u/nusosevuvozasug.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4573e10b71---fuwubazedof.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608769baa30ed---petasimojet.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/fafikeguv.pdf
    • https://hoangnhataudio.vn/media/files/38318736485.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/79cde78a8903122e4dab0e53245de2cb/safovokidipesamas.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/jofub.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fa9588ff7---48938052048.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670afa7675---58313199003.pdf
    • http://immobiliareborghi.com/userfiles/files/5768186987.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6dc7aca11023bbd7c1197445bdb07140/52295465184.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee2b39cf8---bopejavevumenok.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6face9ad71e0db26e21fd25732287496/84595530972.pdf
    • http://autohondl.cz/userfiles/file/gafukumovinim.pdf
    • http://gerd-pollak.de/userfiles/file/6191797011.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/448a73d3e8e7ef80cdb2f404712c19d6/4197049264.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f7.bin
84c795f5fbad56a7e9811c3e8a4610f9aa9ef7a8421f8ae93e07707642a96753
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 17576 bytes
font_01_sfnt_off00010fbe.bin
e2f6a46e38c40c8fec3654512da20f547b8388c2bd9371014de23d035f6890c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 10048 bytes
font_02_sfnt_off00012637.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16792 bytes