Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b3e24a294160b4…

MALICIOUS

PDF

87.4 KB Created: 2021-07-24 10:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8659591ee3279be599a6fc4d7c8e1bb1 SHA-1: e3eec34cafd73ea8c8d9b859dfa4c285d2d50a1c SHA-256: 50b3e24a294160b4928924bb1723203c856e6cdebd067cb6f9e44ca2ed581978
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The document's structure and embedded URLs indicate a phishing lure, likely designed to trick users into downloading a malicious payload disguised as a vehicle registration application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ecb3d03b---vusesejezezekugop.pdf In PDF document text
    • https://equinox-e.com/upload/files/gefuji.pdfIn PDF document text
    • http://barnesfamilyre-union.com/clients/52050/File/lopusivogudis.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c73e94675---xorenumajogaf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tusatcnol97q21i6shjfc6vfa0/76982204173.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/291a2a69e2fcf426ae25d050ba130ea5/zolugagibopuw.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/4252440375.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/fizijixofep.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/be2560c321ad02b3c3a693cbd228ca70/webuxurawazibifanixof.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/dutojewikekategawegu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadc1b8d38---lawumudijeniv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f062dd3055---vimorazet.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/28f0f8174e9bb9e02be1b0185c5de5c2/nogejujolorinazipuneke.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/86121169515.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/d74f9f6199ddd987c8d96ff30d0349d7/ramitenasafole.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06d65b798520a909cac306af17b8d999/28986532164.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/70e0f34eb209b3701be2e8e3915d405b/pikuji.pdfIn PDF document text
    • http://agama-rc.com/upload/files/82399442050.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/15664236617.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd57237fdd---watajozi.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/paxefubesetirugisifu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/71590075638.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b17562fb6---72430011983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nj+dmv+vehicle+registration+application+requestPDF 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_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 11380 bytes
SHA-256: c7be64e6573f27bc5e802e7bada0715a7326761c0202526bee7b8b1d1441a4cc
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 17060 bytes
SHA-256: 292ad078ad4dcaa62ad82187341cba395d3c11b48e9f4f7c91e6a1b3b519a2d4

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