Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a32bb7576b842cb…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 08:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5509a8c3237c6fed79ec1fa6133ea03d SHA-1: b9fc7331ba32bc747a82005ae135b834c5db77bc SHA-256: 8a32bb7576b842cb83a1fe0cdbd769e060d9eaa7ee96799bd03dd07166a82933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=library+services+for+persons+with+disabilities PDF link annotation
    • https://taevlingar.se/images/pages/file/25752131067.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/wogajudokakupolanuvog.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/64881457627.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608255190013e---nokasuditijutodi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee28ba69759---fidifezeku.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/93623884298.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/43910197949.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/nerowanenaxobagak.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/monabolasadef.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c09eb9e7d919d7c72dfeaff027d770c7/21431431767.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/humrr7b306edud1gm8u872d5t4/37645639806.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ea542ce50---zajanebo.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/96546622147.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ea1af7957b815a5ac85debda6929c311/jojojunonagukuredasivelo.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083654395105---najufeti.pdfIn PDF document text
    • http://sushi-belovo.ru/files/kawobiwujunisave.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ea4303ceb190676d9a81e9d2feb1c179/85266367146.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/d9qgbtm5rkj1udmdn0o7jf4ht3/xenit.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/wimunipe.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/35320253678.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/36054662144.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/4a5f6e2aa1b9347604e59c2bb09d517b/kegokeguxowumejinel.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/f0f75e74de8be50129fe5a16fd1a5a41/27644070431.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ebaa95f8---84515320704.pdfIn PDF document text
    • 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_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 17080 bytes
SHA-256: 0a185e8266a543e8915533be1138e59e8e19b3a87b36d5bb35b4f923a20139f6
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 11080 bytes
SHA-256: c9a66bbf786754d624a77da5da601b4ad4a2aa8072e1739b8e254b8a54587283