Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fb685cf9dd347a…

MALICIOUS

PDF

85.0 KB Created: 2021-06-26 13:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 845de506ca6c9178fc12cad9a708d76b SHA-1: 1348c2a49c9c60bf145c673e1ac07a74ae405cd8 SHA-256: c1fb685cf9dd347aa16b7d2fe32f86e4515d3891161be7e719689bb0ad95d0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial access.

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 https://medvor.ru/uplcv?utm_term=anti+corruption+official+website
    • http://ankamet.com/userfiles/file/pepeguxope.pdf
    • http://ahchala.com/img/file/kumisowipopowuwofisupepu.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dadfa7ccb---89132181612.pdf
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/16829365162.pdf
    • https://argumentua.com/i/file/63021959076.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/94fe08be1006923dbf1def22296d2c93/zepesaxojutevanazif.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084b36f226c9---powuju.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca13cbb15---41631868536.pdf
    • http://ulv-fogger.ru/d/files/50397159849.pdf
    • https://narimasu-chintai.net/jcfiles/file/tetumetimojasunulerime.pdf
    • https://gbagencement.fr/uploads/file/70840182864.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2hsn7tbsc2iihd005gbbm8k1p2/jolikomoduborova.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/8a2e0dc70d70b5e6d50795535032cfc7/nukovagisitonavufovide.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6885084f4967a3dc1576007fae1ad57c/xizanimimax.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/27tvhoj85j491gbtr8p0glb457/69180427895.pdf
    • http://csc0351.com/userfiles/file/20210624032518_w5cu88.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1c66c910---77576123724.pdf
    • http://absolutelyneon.com/userfiles/file/virekezozopidip.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c536e74d4ad---zugagaripajezedefir.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e13f16e34b---30489966732.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/29357dae7b7c2e329d0c57af8e6e495e/89106340574.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_off0000e665.bin
b2faa8645724bbcee5069b19c8a8da80c37070e4a01530823962060fa8b919ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 17644 bytes
font_01_sfnt_off0001146f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 16792 bytes
font_02_sfnt_off00012c86.bin
891f84f10df75da39e4d9cd04e85fa4f268da0b95aae21017671d3551cea4613
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C86 10780 bytes