Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbb7dc54b9236ad…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 13:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: e38790109a2083175925ce6b35afb64e SHA-1: eb0348111a9f9c48843ba575a478f630cd28fc8f SHA-256: 3bbb7dc54b9236ad962b8c2b911a23b0f0d707cc2e2f452e971b474c966832d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7566

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://infrive.ru/uplcv?utm_term=dometic+cfx-65dzus+manual PDF link annotation
    • http://edumedcare.pl/upload/files/jixija.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b6419e0d---pebafolefunigulivoresalun.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/jupezodi.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/36569096951.pdfIn PDF document text
    • http://jucal.es/images/file/vopujerafejed.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/73149538690.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hh5c3seb87ak39rpbjkpkis4l9/63389386915.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/tazodukigibamirexal.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad845729fea---60786880406.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/tafigizorabiwagirupok.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/10485009990.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/94700099748.pdfIn PDF document text
    • http://promador.pl/userfiles/file/69379737439.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/remuninimepitosixikeg.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7313a1e56---tajimivavakamozamizu.pdfIn PDF document text
    • http://paliukenas.lt/i/File/simudixi.pdfIn PDF document text
    • http://sns.hu/_user/file/79645723369.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080f78d6187c---10551343547.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785f52bda4d---gitipajesanubabemefu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b9dded75c---dugonikepe.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/373b6aa534f2a709f919d73c7a605999/94701568464.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E6 11136 bytes
SHA-256: 9ddd1bda4ef0044376d5842344a4098974292a942f9fa94eb56b740d52e493a3
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 18532 bytes
SHA-256: 55cd85690877c6914fc7a224ff2578e37e03961d4080d5c077ca5d68f8bfc9ed