Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee4c689800179a5…

MALICIOUS

PDF

55.4 KB Created: 2021-09-02 10:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 735e7a4267a381a6ff9c2a5e3eaed0fb SHA-1: 7048f8dff0e2d3d14e3a45cc83f45e48ef97e520 SHA-256: 8ee4c689800179a5601218575710bdb9141386a3f0e0569605abb96995d90ded
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this redirection infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8379

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 http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870301626d1---vozuzojemi.pdf
    • http://starsunited.at/upload/files/vodex.pdf
    • http://brnc85.com/clients/878796/File/29364450341.pdf
    • https://szaktel.hu/uploads/file/73734475283.pdf
    • http://hiroshima-teishaku.com/userfiles/file/dejilugurusajejo.pdf
    • http://rinsacars.com/files/others/8157388532.pdf
    • http://www.toptehnik.si/images/38113896390.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa46641148f---joxorilunakomawuzi.pdf
    • http://automotiveenergy.cz/userfiles/file/mikodenutelubukerepumatat.pdf
    • http://reutlinger.pl/userfiles/file/nariduvalosexazisafi.pdf
    • http://doo-san.com/userfiles/file/20210719210157.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090ebb0619f9---gikuraliba.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/nekumivolagifo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1ed26591---dodasuxaroj.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/9f2b4c9738b19feae14e3ddc5536a863/fofomubadivi.pdf
    • http://kistours.hu/userfiles/file/68572876077.pdf
    • http://engineersclasses4competition.com/files/others/gojokirudelegosisetawixeg.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/31459818370.pdf
    • https://baxsporthorses.nl/userfiles/file/xukupajifosesopevobasise.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8825ab3be---dukilajofotapuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+parse+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b757.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 16792 bytes

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