Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fda354ef1d0bb3…

MALICIOUS

PDF

91.6 KB Created: 2021-07-02 13:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 733a23806e8ed9f7a943f6a57afb2a52 SHA-1: c00294e6a6e0a5e5c11ac443fc6c2533fab42816 SHA-256: a8fda354ef1d0bb382c55b4d5f79f1f599d24546f10a217426050d38064ee7d8
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The PDF's structure and embedded URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/88b9a3202345014fd77dbf0a19e9a35e/29813431043.pdf
    • https://pharma-tools.eu/galeria/file/10469372492.pdf
    • https://thehero88vip.com/ckfinder/images_store/files/ronujaziwuro.pdf
    • https://gretajensen.com/ckfinder/userfiles/files/xamizogomalekikikovaxojuj.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c73bd3de---vidimitobupaduzebevin.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tpiftfr2usbknhb10int631fn8/42701534505.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3nchabfaj34e3an1d6kpc7pou7/40969001535.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/63fd949fcb6893c5bfadf0858ae74c93/21199389803.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/56596636917.pdf
    • http://bsinteriordesigner.com/userfiles/files/xesexurot.pdf
    • http://www.cafeinca.com/img/public/contenido/file/43112416826.pdf
    • https://abofahed.com/userfiles/file/90135088670.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5aeff99d1a5219efad835d0c6e33aab7/14317242257.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a052961839---46273183921.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce2a5cd0a2---19343590998.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160870de5c664f---kowubefikajezo.pdf
    • http://burchiellati.com./file_fck/file/gejotezilafet.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756b4ea98ff---molanufa.pdf
    • http://gelateriacool.it/userfiles/files/simevigujarizolos.pdf
    • http://breakevenpoint.pl/uploads/editor/file/34008225850.pdf
    • http://fittbikese.hu/files/file/28590505812.pdf
    • http://batiment-tunisie.com/userfiles/file/23396776637.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160772d6bde0db---wikoga.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/6159b8e81a0a6353e4bc83a9acc785c4/79132426171.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=porky+pig+looney+tunes+show
    • 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_off0001028c.bin
2b76bf3cddbbf5eaf9fc5ab4f5750bc67d8ab98c715cd5633ff81b89dd7ae482
pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 17836 bytes
font_01_sfnt_off000130d5.bin
d6657b698ce074b2aab63ca0590d847f0c9429e1eca653d940a04b46364129bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 10764 bytes
font_02_sfnt_off000149a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149A0 16792 bytes