Malicious PDF — malware analysis report

Static analysis result for SHA-256 29956fe83762367f…

MALICIOUS

PDF

189.3 KB Created: 2021-07-04 08:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44fa14553673362a8473451ef94580f6 SHA-1: a9c6b94adca8f500cc44988d446c553095b4f745 SHA-256: 29956fe83762367f31625ea37093e3e94cda1bd79e20901af0a37cd3cb184e08
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are likely used to host phishing content or distribute further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://catamma.ru/uplcv?utm_term=sociology+word+derived+from
    • http://sosnovgeo.ru/userfiles/file/1724908348.pdf
    • http://cipetbhopal.com/webimg/files/ragolaled.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078e41902abb---1433132623.pdf
    • https://aduanaldelvalle.com/userfiles/file/9859253733.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/68d9912d9a5ab0886fa9c107ac049780/88910898181.pdf
    • https://ceral.pl/ceral/pliki/file/91496230357.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c0d93fd4b---janokotajotibu.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a509a90c---moponarekeguk.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/4726094934bc9ad4f8e5919f96eeff81/resufunodixabidaxoliludu.pdf
    • https://dijitalsanat.link/upload/files/dijesoxojokadele.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bisunovokejuzugom.pdf
    • http://al-farh-iq.com/upload/userfiles/file/xamofufut.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8ec0b732---jadanobolumemelelofunado.pdf
    • http://ash-graphy.com/userfiles/file/bevetudojologukugalom.pdf
    • https://alsultantrading.ae/userfiles/files/vikikegepobitalo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ec75267e---46648763370.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ad87c9d37---32988799246.pdf
    • https://ikuseikyokai.jp/ckmedia//files/86250516586.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6902577cd51db71a5e4cd385a708c352/fagapu.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/40666261122.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c014bde15d---kumomepikasevugazozomufo.pdf
    • https://bbu.vn/Images_upload/files/63076347596.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7de367fd4409e83ba145fa57f922904e/xirosijuxovotof.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32366396c---65319042595.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002845f.bin
a6ba18c8e1be4b573bfb363d8027d7aa696d5e36d5cdc06c23e3113e8f45fecc
pdf-font-stream PDF embedded font (sfnt) at offset 0x2845F 10628 bytes
font_01_sfnt_off00029c88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x29C88 16792 bytes
font_02_sfnt_off0002b49a.bin
9ca562d880b4bf7c7a0a35cffeb3ac53b993c15d49f69520e17a24bd1291ba15
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B49A 19960 bytes