Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8803fc8f4afe168…

MALICIOUS

PDF

41.2 KB Created: 2021-09-28 06:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6c9da2d72af9bd0baf3253f79ce627c0 SHA-1: a4ff37315d4663fabb63d8ff2fba6a036a3c607c SHA-256: b8803fc8f4afe168ae49854b46361bacc32d34b42325a11a5536a00135d5cbe5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded clickable links. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external links, including one pointing to a compromised WordPress upload directory, suggests the primary goal is to redirect users to potentially malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7349

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://luijkzonwering.nl/image/file/36873246679.pdf In PDF document text
    • http://sartoriaventurini.com/userfiles/files/perobelitelofonu.pdfIn PDF document text
    • https://sk-elektron.ru/ckfinder/userfiles/files/57074921007.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/lalivejawivuv.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f063fcdb8a---xerewisevinijanababo.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/sisoxadaza.pdfIn PDF document text
    • https://equalland.com/uploads/File/25400253893.pdfIn PDF document text
    • http://mweb.cz/images/file/3900306759.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109102322053142.pdfIn PDF document text
    • http://flirdining.com/uploads/files/57944777699.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/fokewafesegoxaxudiwox.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/273406367613612d348b50.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/jagovefog.pdfIn PDF document text
    • http://budka39.ru/files/kuzopifunuxikofun.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210901083318.pdfIn PDF document text
    • https://niceppl.com/images/file/62838752848.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/godirinunagabuxexisewu.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/56284705975.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/3931777731.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/25433014925.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161501e20289d2---56460203281.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/45739d81cbd0341bcdfb373fff84609b/19103796259.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bopube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+can+i+tell+if+someone+viewed+my+instagramPDF link annotation

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