Malicious PDF — malware analysis report

Static analysis result for SHA-256 387c1f7f76f0574e…

MALICIOUS

PDF

74.3 KB Created: 2021-08-02 14:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78e3b0d7f9ecbd0d2aace6038b62e257 SHA-1: 917f70ecbb9ec3c04724829a6b8efe13c4670383 SHA-256: 387c1f7f76f0574e0bf0b7cf083f63fc9e1f28f8a308c290df1054b6541c74cf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://inciboya.com/resimler/site/files/42750275481.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210605_2C5C86ECA1930ED4.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mnssvk9g1njfu5hc5mh1juqhv8/tumugeguxa.pdf
    • http://ehs1958.org/clients/73155/File/47677481175.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/374e920763791094f34dd5d610e7d046/61222169633.pdf
    • http://chinawin-consult.com/userfiles/17139175898.pdf
    • http://andrenickels.de/ckfinder/userfiles/files/87778496068.pdf
    • https://aonetreks.com/uploads/file/3477890755.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814b9f6d441---tevanikixuva.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/jogexuw.pdf
    • https://fitness-sport.it/userfiles/file/54705928819.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/dgced2ujdngfatoaq8rra0qu2b/48116813483.pdf
    • http://www.cbs-emballages.com/upload/file/99319499697.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/46a3e81c274e55ea28924cb4131fd1bd/zepodovizilukororuvexilij.pdf
    • https://noddy.nu/images/file/fifuseru.pdf
    • http://x04ydivan.ru/userfiles/file/92472456159.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/giridamexepunolavi.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e691b3f2a---74556494529.pdf
    • http://hanboo.cn/Uploads/file/2021061219323570554.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/banotonijagerofisupemoro.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548b6a5d96---xinerokovodowaruxokikozu.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/86cad0d846646e81e2eee767f5c63977/23328370238.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/df846e93c6f8994ee43c0ddbb367c92c/betowoxoladofopisunadesu.pdf
    • http://pratiklinik.com/img/userfiles/files/32000141926.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=relational+algebra+practice+problems+with+solutions
    • 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_off0000bfb8.bin
54c13109591f7826917a7ce5b3da5fb0dab7fdff9e4c89b9ee13adb310d7e721
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB8 15720 bytes
font_01_sfnt_off0000e7e1.bin
455226a2c201086a5d96e6688d5c8c06a40aec4003db675ec984873dd3dd9b66
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 11192 bytes
font_02_sfnt_off000101bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 16792 bytes