Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da93d6d2278bb08…

MALICIOUS

PDF

72.1 KB Created: 2021-09-22 15:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 837859c99ae05ced4b96f0d9541fec85 SHA-1: 6927085db07959e438191954220296f625079c80 SHA-256: 3da93d6d2278bb08768ff3bf2774995f29c34a1af1f625ceea327e22b3227040
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The embedded URLs and link farm heuristics suggest the document is designed to redirect users to compromised websites or disposable hosting to download further malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6686

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://krisoc.ru/uplcv?utm_term=setup+icloud+email+on+android PDF link annotation
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/pidexewikejebalumetadiz.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/xutazomekirutijifogekuzup.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/48358637101.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/jozinapumixixinufixazo.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/30884350042.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/vagexukakabafirivona.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/6851672359.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d296f21e4---96552890830.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148d715548f8---vanuwanavube.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/49340722248.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/wabotumamojirowegorovo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147e7783e2cd---rafogoxunujijodekavi.pdfIn PDF document text
    • https://wildnaturetravel.com/File/49560846949.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/6501439539.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/degevidev.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/bezowebukuxadeg.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/kofumugu.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/morofimofaxazisuwipo.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/levitumixuvatazixubexe.pdfIn PDF document text
    • http://aquatherm-graz.at/files/vivomojase.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/fukus.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/47401180222.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/49513247888.pdfIn PDF document text
    • https://sanidom.pl/img/file/97650806923.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/8803807906.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_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 19336 bytes
SHA-256: 5e10adfd2fb67faa4e05d2f55828a0b116f7578658d3f693d933a491938140e3

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