Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fb42e167a199c2…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 09:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8af0306d3b2cfcc1e4aca03d55f83b9 SHA-1: 780ad740575f54ef08fc565a7f282d2c5915e04d SHA-256: 37fb42e167a199c2de692d4e078d13db8d2a8d0a2e0f6385e85e0e24485282af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://huntic.ru/uplcv?utm_term=block+craft+hack+apk PDF link annotation
    • http://gpsputhuppally.com/userfiles/file/betimimedumuko.pdfIn PDF document text
    • http://cpils.com/userfiles/file/madenopebotevejenigopani.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/gesonodetirejasogodiwu.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/5945379635.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/5043784397.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150ef4cb3c51---9706483792.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/68674878444.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kizadomuwukipelo.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/37495575657.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/netopopefib.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614709423c9f5---lavolatogate.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/p1jhqt31942prubp7r9r31qpt7/sebos.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e738e9df0b757c89dfe7a09fd7e4feda/60131319633.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/62523426004.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/lazewelidutinakadanetuvip.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/72348803065.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/37944683165.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/jajazogol.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/karudamulinofupisarofe.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesevefarolefujikodi.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/89493557949.pdfIn PDF document text
    • http://techmechengineers.com/uploads/nubonozedonevuxo.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/71619982243.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000af4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 15400 bytes
SHA-256: fdde414646f66f83759eea6dca4dd400a8e77610a7fdd9fc535ce743913b0181
font_01_sfnt_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10224 bytes
SHA-256: 0abf7dee294a79b4557b34d3b202e87d839861fab678bf65451d51031e0b0f7d

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