Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e6e38f7486ea09…

MALICIOUS

PDF

81.6 KB Created: 2021-06-06 02:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1224466d24d470f16e73911e8e9fef38 SHA-1: 5b99f6d75d49fd5dbe9ad05e4da2539ef8dd516e SHA-256: 33e6e38f7486ea099af5ae291bc3adea6d123b8406f339c9e30b3f9b3e66632a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=que+es+el+movimiento+circular+uniforme+variado
    • http://auxerretv.com/content/public/file/92152413494.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37fc635ce7---nozupaxuseloriri.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a4a205ea---vizirokisezafaninoxas.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb51d2b9b---fojigurena.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9de5d4a6---91740415954.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4e4cf6978b43e6c1d86bff559a2dd504/18977696538.pdf
    • http://akinmedikal.com/uploads/file/97654958383.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac03688a4d6---83534810109.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/75929738619.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/wizowakaz.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9711c0de49d4886d93e72c2968a36e3d/66118888860.pdf
    • http://wadirumshootingstars.com/userfiles/file/%5C/35670405469.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6ce10d45f5ff2fdbf2206287e2501b2d/86522996584.pdf
    • http://anatolianlgs.com/userfiles/file/29239933390.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/496727891b1d4cc5a3dcb45fa15b9913/debebasaravuvan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df57.bin
7cedd89a995792179865b046d1bf5de19c503b0a9da303ea1dce52d3c9f3bf3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 5172 bytes
font_01_sfnt_off0000f0db.bin
2dded63e26d586e1bce38d74d7e55ea24a9b983827fd20a809d34989756d69fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 12352 bytes
font_02_sfnt_off000119b3.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 16036 bytes
font_03_sfnt_off00012e1b.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 4324 bytes