Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08686b5193b3003…

MALICIOUS

PDF

60.5 KB Created: 2021-09-15 21:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2267bc880ecc3c19894624499ce233aa SHA-1: 1b93ac64f84fb860b52561d4a9ca0802adbe9311 SHA-256: d08686b5193b3003d60491f7f8cff56d57b475484022d320071be9d46188d3d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting domains. The presence of `utm_term` parameters suggests a phishing or SEO-based lure to entice users to click through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7265

Heuristics 5

  • 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
  • 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://garglob.ru/uplcv?utm_term=warriors+the+apprentice%27s+quest+pdf PDF link annotation
    • https://gym-rectif.fr/ckfinder/userfiles/files/ragefemivipifinoteneni.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/vubuvuketarixufigef.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210908_8D4E2408F294AD73.pdfIn PDF document text
    • http://retailcop.ca/files/lexorena.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/52164729158.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/28510747947.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/35197931997.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/41524236012.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/dopetodavoz.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/a1ba6155daaa7348f471f75aa54783e2/12051441019.pdfIn PDF document text
    • http://domainecomps.com/documents/files/70824505954.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130140d31d4c---9819053094.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2lo4vilc2f21b2a9vfa2dlqq6d/xatamogisovubifaz.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/wuleruruna.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/38772259020.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135759f1941f---fejivitaxajomuwezuja.pdfIn PDF document text
    • http://status.cz/UserFiles/File/taxemanesokatazit.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d8ab3e5a---98864826513.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/63676438074.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/67414398427.pdfIn PDF document text
    • https://papiratisk.cz/soubory/79797405138.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/puzal.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/zivuserowolon.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_off0000c636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC636 10944 bytes
SHA-256: 1b099076b5e8b0e6e196aece6043ae2326dcce3f7c5b06a5e0c4953a01201eea

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