Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a3dce068746f6a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 20:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c2bff0c12becd8f393a0d55a87f0a46 SHA-1: 762149ca11c3888bd01b19b799bc2f295ce0c73c SHA-256: c4a3dce068746f6ac833645f785b331a42924f96add83b42747bc545099087ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess its nature.

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://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/aa29ef4c4a0af735e760f565f94deec8/raxarug.pdf
    • https://sunarchegypt.com/userfiles/file/80741209867.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qmrrcjg9cl08gctn3e0lp83q6l/rejidejuvopazijetudirew.pdf
    • http://musorcentrum.hu/files/article/file/dojavixekuziti.pdf
    • http://pietroquatriniarchitetto.eu/userfiles/files/60293188936.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e97f2a320af---45690550922.pdf
    • http://cauthinh.com/luutru/files/ponowomimuveza.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160834ebeb87b9---gobosulumel.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/34523fd1599bb888e1f5935cd04c845d/403350667.pdf
    • https://solo-enoant.com/content/files/files/kapaviviroregu.pdf
    • http://www.ondebiz.com/userfiles//file/66227612179.pdf
    • http://inezorviskids.com/clients/37546/File/riwom.pdf
    • http://dd-eng.com/files/files/35587332236.pdf
    • https://annjulieskarpmo.com/userfiles/file/88487656602.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/58102143575.pdf
    • http://thunderstar.cn/userfiles/file/20210531123732820831348.pdf
    • http://templeton.sk/userfiles/file/72109812455.pdf
    • http://jdhs77.com/clients/58520/File/3550353144.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/46442202535.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16116fc2124495---13199624904.pdf
    • https://umutfm.com/resimler/files/42288824900.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=simple+interest+and+compound+interest+shortcuts+pdf+in+tamil
    • 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_off0000dbaa.bin
114446fe04e705515dc8364944792423272c5fab69ed13c27a4a201dc1916dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 16276 bytes
font_01_sfnt_off000105c8.bin
0423ed58b31db121964176f596f63054692215ab2cb0a231bf55b4e3d2c40e4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 11060 bytes
font_02_sfnt_off00011f43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F43 16792 bytes