Malicious PDF — malware analysis report

Static analysis result for SHA-256 489382ea2f73409c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 03:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cae165c15c9240c2306e27b9d051be87 SHA-1: fa5865a4289ae74de4a565e802372e4827f6a6e3 SHA-256: 489382ea2f73409c05ac638580a650f31ccf8b2e9894d0c3005b2b8381313e68
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8945

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=salvatore+quasimodo+poems+pdf PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/svje23t1ddq475q4l85ulfb4ul/35356820981.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/penekona.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/digogavopef.pdfIn PDF document text
    • http://inercial.es/uploads/files/tuvadov.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/vevenojoxuzimawawi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160964f9f1f026---81703993398.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/vuxas.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/piduwopatebijobu.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/zomudonarize.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/408255762.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/808e22515ee4740d8ed95490252b3f49/90194584547.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608522438776d---22966613527.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/gotanogalefupuvelasebe.pdfIn PDF document text
    • http://laduses.nl/image/file/gebuwilo.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/83335052267.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/10695918041.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/93d68b5c4ee5246fa49f5bb66fa5eae6/83569154758.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/duvuwujulikawoseko.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991868dd5e---dumofimijeki.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acface157af---30702424894.pdfIn PDF document text
    • https://www.nlg.com.np/assets/ckfinder/userfiles/files/rutekemipo.pdfIn PDF document text
    • http://asfalon.com/__files/file/bokotisepet.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 18452 bytes
SHA-256: fea92d8d9c3e1bc0e00e956d0a3d425cfbfffc158bf9aa160de478d77cabcc50
font_01_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB9 10944 bytes
SHA-256: a94cc0eab8729958556f036ffd3b55813f6241eae002f9328ceff5ed4972ed0c

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