Malicious PDF — malware analysis report

Static analysis result for SHA-256 326362ca827040c4…

MALICIOUS

PDF

92.3 KB Created: 2021-09-07 10:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfad079acdd6768f9765850195d4037e SHA-1: f71edb70132b2156cfc21745eb9cb03f52995dfb SHA-256: 326362ca827040c4bc579444a311f7aecc435376457c58e305722eb5ee553dde
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the nature of the URLs and the heuristic firings suggest a multi-stage attack where the PDF acts as a lure to download further malicious content.

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 https://sporyolu.com/resimler/files/22105063292.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/936i1k1csrm8664dbp2lk4dnu7/29383019068.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/zowimopasopowajazizoduzo.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/31841457329.pdf
    • http://smflow.in/admin/uploads/file/movasesaxuwigipuvixaden.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075de0c89af2---moverasapezugusapap.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fe5d81c4a---3367804770.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160defd31d9469---zufijapatuxosu.pdf
    • http://innotec-industrie.be/userfiles/file/60322899313.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084168059561---gifogasiwolibi.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n1lgck3k196umpifioe4pvd3fg/95710471955.pdf
    • http://dailycan.com/userfiles/files/xakugajepaxaxebatejek.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085838773487---zoruvesaburepogef.pdf
    • http://bhhangkhong.com/upload/images/files/364128008.pdf
    • http://yilip.net/userData/board/file/tavisagiwe.pdf
    • https://hizlipin.com/calisma2/files/uploads/5359561954.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b18561ce---zapitapunogugofot.pdf
    • http://forglass.sk/userfiles/file/34500651530.pdf
    • https://mecaniquekd.ca/upload/file/zedovuleromenuvisininum.pdf
    • http://xiaohecollege.com/d/files/gugufavowifaberavow.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a40a63853---depitiradem.pdf
    • http://gift-founder.com/archive/upload/files/40612683685.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/dusixojewoxebasaxaporot.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/faxibogijepilirodom.pdf
    • http://www.farnostbobrova.cz/ckfinder/files/80057588633.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=manual+de+procedimientos+de+terapia+intensiva+adultos+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_off0000ff9f.bin
4eba63d5e82edd859b59fca1f9782b138fd4bf8f23958a835ea08acc16004071
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 19968 bytes
font_01_sfnt_off00013213.bin
255e7aa59601e33a00d4f102741b362c5096ddda7028ea27ec20a975d99a9b80
pdf-font-stream PDF embedded font (sfnt) at offset 0x13213 10940 bytes
font_02_sfnt_off00014b64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B64 16792 bytes