Malicious PDF — malware analysis report

Static analysis result for SHA-256 4026eb50f04361a1…

MALICIOUS

PDF

64.0 KB Created: 2021-08-10 14:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f46afbce1a83c95e0f7574d5d7028259 SHA-1: e668ffb2c4f22f5fd5d3b5ba1709be2f25ee24cc SHA-256: 4026eb50f04361a11688e8a61b2bbb7633b384c2d33655743cca73efc1b6dcfd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8628

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://drafthe.ru/uplcv?utm_term=como+se+realiza+un+mapa+cognitivo+de+aspectos+comunes PDF link annotation
    • http://dsagco.com/Upload/file/muxeketubava.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a118141c7---98197100137.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/fewikimumufur.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6171e67502---67446390828.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e279d982d---fojinojiranabubogev.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/zajofave.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/5112934bba9dbbe45a2642cbcedf33c9/ripavofavud.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/wesosusimuveliru.pdfIn PDF document text
    • http://aplus.to/userfiles/file/visoze.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b9a1cc8a---69473686951.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/lomiwu.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gaxodabowe.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kenubil.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f5205f6cf---nudepiwaferatigesenozo.pdfIn PDF document text
    • https://schmitz.cz/res/file/molef.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae69a4a77---50827438804.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/86623908341.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c12db775---58538798985.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba77aa690---wumamiruguwasifutevasa.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/37084368310.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/50187979477.pdfIn PDF document text
    • http://tipiland.net/upload/file/46163143865.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/daroguva.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_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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