Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6f2f75c1213038…

MALICIOUS

PDF

86.9 KB Created: 2021-08-09 15:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc7c30e7389a4aa492570fb8e467bdcf SHA-1: 532b34a9c005499e7cb40cb33a21a17294f30044 SHA-256: 4d6f2f75c121303854a5ad0b2c06503f63ef15f27640337c46f274cae3f9bc4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://i-daa-wl.de/userfiles/zusenome.pdf In PDF document text
    • https://patc.fr/imagesfile/zitojoxinaxudiretega.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608722eeca3ac---55213423659.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/67753062395.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/komevodixupafulisamikexet.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p7a1m44vtoaqediaemvfkratl6/vifedulapawukekoj.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/14335775267.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/26055996000.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7de620e13---mawum.pdfIn PDF document text
    • http://moristas.com/userfiles/files/panezovujetusutoj.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aa4905b183d05cdb425af0f027ab30c0/87208203220.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607adab893457---zogumamadiza.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e75e9271edfc1e6c80fe278ec652c86/56900688806.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083553fbfbf7---sakexemogurijununazip.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/n1fm2sei79c23n9c2gk3dm4edg/detelazan.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f0eda2e6b0e---68548009049.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/gopofiker.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608401e8c276c---xokawikuputiwuzazegusiter.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/wenogelox.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/70a2cc9b632882b09e4f7d03918c9491/wazomijob.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/99eecbfc4ff88f9976bd17fb31722029/59908137160.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/56118394261.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0411f26c8d7db393d5bc3465c1183ecf/muripodix.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb538222c---nikidikodiduseva.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mirov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=an+introduction+to+linguistics+loreto+todd+pdf+free+downloadPDF 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_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 17328 bytes
SHA-256: dfb814a7341e0f1b048be5ce253f8b303266736ddae4e08218ba918141a171e3
font_02_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 10960 bytes
SHA-256: f2d14a4ceae384842cd81846a24631ca37a0b993dba18fe3c15143356c211dee

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