Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b670b0ea9b42bf…

MALICIOUS

PDF

127.8 KB Created: 2021-07-25 23:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 600011256b0ef1a4260f22f2aec0c544 SHA-1: 8f25c9ac34037d8b18771b3c91bcab4aef0709d3 SHA-256: a4b670b0ea9b42bf381246f3a4a6985ac9e800799432b84e9df404ea609a2e77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these compromised sites. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9723

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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/43dd0ed0378d1ad45f41236c851b587c/sozovawugil.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/217897a4be5011082cd7e76d4c288112/79266011190.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160abc651a81b8---puninodinemem.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/993fe15c0ec70166bb5adb2e85ae63d3/direkewa.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/97g5j2aursb3rum90p6cqmemik/fimuxebiteforab.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/4fa4b76cd5e07c2d69bd9206302f70a3/sijiwal.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8685ffd0093275a576cc855d3b45d1b0/15601654014.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4a1166bde---dinatekufolabuga.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba53cb5c41b---94897487187.pdfIn PDF document text
    • http://willbramephotography.com/16780602175.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/2694562485.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/baziru.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/68787359401.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e8d7c2c17---tifubanijugawabi.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/26395675855.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/nafomadano.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/24825059865.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/63051798380.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/26832792153.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f78d54335c4a1cee0359f1123a6e12fd/fuzorosawiranekukosatu.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/88307249685.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bc77e9b89648d67450b558f94feaf84d/76978210112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+pair+mpow+m5PDF link annotation
    • 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_off0001d063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D063 18648 bytes
SHA-256: afdc1f8180100076af2afb689599a340c58b15a9017d412688e29a655f1ea2a5

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