Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2f66cbc4376b7e…

MALICIOUS

PDF

71.1 KB Created: 2021-08-04 10:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a17b5931de1590875afd1aa85d2cc69 SHA-1: 8a0a073fe3bce88f39087bf308f061bc163c960f SHA-256: 4a2f66cbc4376b7ea090a18782e1e32d74130e532161048cd93733194c00e3cd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7427

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://kocarbon.vn/luutru/files/10912701987.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d428113e4c---74627730138.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/labiwosumikul.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/d5e3d2182b389137766bd51807be80e8/88790450926.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d27d0c6af3ba4dfc6230f98f25f03aed/xanutimimeme.pdfIn PDF document text
    • http://faxik.online/ckfinder/userfiles/files/bejorujolakufojusomabet.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/a6f8c9276d60e2ce4e7c509179fbea69/17715929198.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/fojofupijezuzazutibavi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lurodabewobu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6c34c11bb9ee94fc30c86c63bcdbdf80/kofagefedul.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/38572852456.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2b0dc415---fugokesefexomi.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/rejetemiwovo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793a581c6ef---wolepifozironikakam.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/8570416322.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/lexodiwusitiriwogofaput.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/78907767433.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/6104616641.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/897393b48dec577aaa36acf5e2495848/63637135955.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/etc4k0c1aid4tud5ipjt264f06/42130562110.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/vubolirofupudeki.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/milopenutewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+your+own+treasure+island+acnhPDF 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_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 17424 bytes
SHA-256: 9a0613bfab4da262223e3fb270b63b7873ca95f6bdbf4739009d1cbf8cb29375

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