Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d847174070e27c4…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 14:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1086609a9b21caf90bea61c18b78dd76 SHA-1: 0101486fc605bb6770048f4897e98c23f9ca7d3b SHA-256: 5d847174070e27c4fb77d995b75460fa51a433ddea7c1b660dc2f692dd2e3360
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8400

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=movie+english+subtitles PDF link annotation
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/jonim.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae0ae3e1d64282c298d2839efd5bfc73/degixikiwusililewosenewe.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/loloviroluxesurerojexezep.pdfIn PDF document text
    • https://777mto.info/contents/files/tikepanezofezotiluse.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/28236197422.pdfIn PDF document text
    • http://pmke.cz/pictures/files/36906452690.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f130ff092a---jitopudonoxawi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614310430c7b3---63059588093.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bc53ec1d5b2267eabbcd271dd5c7ea85/80328371312.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/78088149321.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdd0728c1---77847140358.pdfIn PDF document text
    • https://adium.ru/userfiles/file/lakurakomaserimanarog.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/13421238238.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161430437c9369---nigijil.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/kixomogibafele.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/tizobodetewowoxedu.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/numapibekobawuropiz.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/zogizilexapexojurufubo.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/29062775523.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/34661530344.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/33632278943.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630943278648342830.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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