Malicious PDF — malware analysis report

Static analysis result for SHA-256 f376c23e9d5fe897…

MALICIOUS

PDF

94.6 KB Created: 2021-07-08 05:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9aae284c0ff820c1d34485322f250ce8 SHA-1: fb7fa39168ef145307b18edca687fb89312e5db0 SHA-256: f376c23e9d5fe897b37beefca276da7f8d1ccfaad3e1fe91206ca4439161ce22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • 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://togeltop.net/contents//files/laferonezowepaxepiduz.pdf In PDF document text
    • http://daiichibus.vn/uploads/news_file/50574114671.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/89597235829.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1720ae383---sabazikifavuvamuxilap.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608472c05f057---68413347959.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9f052797---59742700845.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/40ceabb8a5863625f5b438b2f1f3f8d7.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/42037074041.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/70153430336.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a1a2cf0ab3e10904b19f3f22ac17575f/jazisunodowekabebisoduw.pdfIn PDF document text
    • http://midel.me/userfiles/file/17512633423.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/qdvsvoa5eqtand1j94q40a5pts/41494522810.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/62402335404.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b64a5a81---tumumukot.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/87674347949.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077335a3470f---towulugorijenofufow.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lemakepidojamoludituz.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ac76f0fe41e66c21f8e3d3e1258fd3e5/58419358791.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8c13cd12---nexepefaf.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ickcjo6sqjv0qdosmj589s4a8l/jekafijiverapakefari.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/54569048056.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/2352550176.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160735297ee8d2---xebafako.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mpndschrdlaej7fopuk2jn5qb4/34724901789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+honours+of+scotlandPDF 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_off0001105c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105C 10544 bytes
SHA-256: f99682a04f409baa495840465edb106bd53ee53fc0d64f8aa299380d8476043e
font_01_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14076 17508 bytes
SHA-256: 348f0b4d4df204b12d6d18bd14fd0b9ef2a1941635ea74f242ec5fc6000b1129

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