Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f16bf90caa0c33…

MALICIOUS

PDF

64.0 KB Created: 2021-09-06 01:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94697e2627507409d16328ecc124e214 SHA-1: 3de7056f3353c4c47c34e42390750830ad9469e6 SHA-256: 62f16bf90caa0c3366dbacce67f97e36861a82648c1e7dee0174b725f0b7fb5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to trick users into downloading further malicious payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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://nomylo.ru/uplcv?utm_term=download+pdf+reader+apk+pure PDF link annotation
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1e42e3a0c79402187deba6c27f7d55f9/jesuj.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/47406283255.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/turutirumubodu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160741ab85198f---27600767415.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f7e4d706c---pijikipuzofetekuxozor.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1629000982/files/87234032565.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/55790477131.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/128505fc2c7567beade2f95bdd76bcef/36680678036.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160942b5ce2e99---nolibuvizisekamowuxepak.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/53760410447.pdfIn PDF document text
    • http://aven.su/userfiles/file/97592088685.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/12240349118.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/49213468466.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/fesemasegipixejuwaxi.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/76883442332.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/seruxedoxotojarafi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2c203cc8f1d9a4cb2ce75f2c85cad24d/doxuzazudam.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91c84a64e---jajowagokowiti.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/kamuwuxiwirakototujumizoj.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/vudobaretexegawafuxakixix.pdfIn PDF document text
    • http://nensi.si/upload/file/rozexikedizojulemex.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kumowuxezorafov.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/lusoxid.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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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