Malicious PDF — malware analysis report

Static analysis result for SHA-256 3329bc635ced105b…

MALICIOUS

PDF

89.6 KB Created: 2021-08-06 16:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 98c5bc4bd1ca0d5902a04ecb259731d6 SHA-1: 0b0a519afb5928387794e0007b55735da36fe8e9 SHA-256: 3329bc635ced105bb5f83b5a48350315af7e8de0d41449791ad3135415029bdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document 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 WordPress sites, likely serving as a distribution point for further malicious content. No scripts were extracted, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bcaa4965---93250017229.pdf In PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/b856abf8d885e8d0ab39a97772e187c4/40578083923.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f9eadd30ff9e4a2d893a9550062c7396/18308216217.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fd09708e655---32003670372.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/fbd1d352d9fe03200437f155352c2730/mejugoxevuxizo.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sqt0itvd0aqrep6celngrd5c70/kenomebibisenevipezajow.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c706bf151---junopaj.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9016357e07---xinapazexibuwezexumesava.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/73127436939.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/v5rt46qd7loc6qk9nbvm7cab73/99340894350.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b30116960d---vinoxugogeruluseriguva.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/82167662678.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f4cce492ef54e56144c9edcd86c18abf/wizokinokisusipapivesew.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/10773113448.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/79837333708.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/50783001487.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/5309835622.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fe7krmdnd11moa3igi569rie49/loferegan.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bffaed84---zufikinakukaduxularuf.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/74736011487.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/nasifatetiwalotemapad.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/79087647550.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/44563747705.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c686d23116f---xurulejexefewax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=good+cars+under+5000+dollarsPDF 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_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 17612 bytes
SHA-256: 5e4c635b7bc3582a24bec5423e47542acd52fd228377a77d9595732ba7fa1f6b
font_02_sfnt_off00013f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1A 10568 bytes
SHA-256: 1c4de4986c09afbe5ed962bdf7423ddb5e4520765fe0179028afe4dc255bdf56