Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c329bbfb6b0dffb…

MALICIOUS

PDF

92.4 KB Created: 2021-08-08 23:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33962ac6a36e3d40e1cad12f8ca03818 SHA-1: 4e7e7609c2fa012425b83a114a688f7a886e34a6 SHA-256: 1c329bbfb6b0dffb8fa520227fb1b62177511aabdea6ae635e4144aa206a7d0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to lure users into downloading files, likely malware, by disguising them as legitimate software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://archism.ru/uplcv?utm_term=windows+xp+service+pack+1+free+download+full+version+with+key PDF link annotation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4u9jc7l9aujg5jkr45i2s7n3i2/48105053356.pdfIn PDF document text
    • http://webs123.com/userfiles/file/80600314745.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/91045139050.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/843c130b44f2e7c0b1f14dfb6d6ddeff/zogorakubi.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/kolapefirevanezod.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/vafitejadupewovuraxexena.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/255ad91b4068417dc39da79cd18cf4c1/35810280518.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c019b9ea614---tobarorunekadimogugubaz.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7ff840bb09c49e9dc5c2bf1ec154aba4/gejuxujusepaguzivuguze.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/99355506854.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/kixufufokosubikufudenuwe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/sqdagcjdgnqsdia7ftns5ji4a2/wavuxaxutidofinumig.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/299e54a3f3e8b67deb3e0f222a28af9f/68383871141.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d7bd8d89---25142099972.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/bugitiji.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/6nammv3alqesti6dla7rnbno0e/71504587325.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/77899606334.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/979499be798bb598a2307ddd6f1d439d/lufud.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/637531677.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/24258370871.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/24618432580.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/89517141805.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/9379446921.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/pekilujobefilem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 11324 bytes
SHA-256: 41c945dc717795eb6cce9008268703dd9485b152c2e895e1aee377815d735f74
font_01_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 17920 bytes
SHA-256: 56172baec700409876a2f91b161c4fdc4b382fa1501f81ba28bd884f30e3e62e

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