Malicious PDF — malware analysis report

Static analysis result for SHA-256 d94db23a64fd2425…

MALICIOUS

PDF

77.5 KB Created: 2021-06-17 06:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbecef703f9f6b9f74b12ff8b18913bb SHA-1: 2d2100346ca2b843e6be7a6e39043d2a3feb6eed SHA-256: d94db23a64fd2425880aed15be4834aba90a2516039cf3103b1e02753b2b8fe7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=parallax+pro+apk
    • http://zaun-produzent.de/userfiles/file/dinobupadawo.pdf
    • http://stromzeleny.cz/file/72115961878.pdf
    • http://all-pass.com/folder/editor/file/pubefokinu.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/16cb66bbc308cfe27bc349faca17d056/31971109388.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea38dd8f47---49307946988.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/856c9b7bdcc31b365016e9a031b4e749/95418462339.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/3d725284beafe4dd22a3fcf0d79e8d6b/2912398639.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae751035ee---21912842559.pdf
    • https://bd-sokolovska.eu/userfiles/file/sujejatawi.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/natupabu.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/khnpn8iv3o13n80aa3t5n1et4i/jububenowiropere.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac907ed831e---zebuxuvumi.pdf
    • http://pvvc.cz/files/kunuludimusafudoredotomu.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607116db61def---21747792362.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef7e3afad0---2948762723.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608133c580330---buwop.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88d754904a---dujejozowuwipo.pdf
    • https://tecnibat.net/uploads/archivos/kiwerudidepuluxokazato.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b7.bin
4e10b6e92b0840d67a6fd09d5b06d1e247a2f5a4689c7d2d87f4ad06a8b3e839		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 4768 bytes
font_01_sfnt_off000104ff.bin
7f2db792665dd221ecfdb03fb015d1378698260d6daec4202dadf4bec3085fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 10592 bytes

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