Malicious PDF — malware analysis report

Static analysis result for SHA-256 c864a0d3005779c7…

MALICIOUS

PDF

93.3 KB Created: 2021-08-02 21:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b92f0c5f8075e7431cb5891bf6f65c8a SHA-1: f8feb2a9ca19d61fccf81d8a46f21cc41a4b4a81 SHA-256: c864a0d3005779c7b6c758b4f8fe75ee18bdb07ee323e8d56e6e228d20b8b64c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=kawasaki+zx150+krr+for+sale PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lk1t3ptt8094m3hs3ajvdnq11o/bukolifuvariwipav.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/kavosujamilaranut.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161050e769faa2---29566190014.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/84603264377.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6544e3fc515eab512ccd8a5418d6be8f/popesafotakaletaxo.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/12248069549.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a3e740e23a68070f32e5aa2d218e8f60/xuzudibiz.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826de35c016---vuwusot.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a1e8a8ba---tuvusisugawal.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3kht8e2p6fqtb33vs5bf2vcpf/45651123120.pdfIn PDF document text
    • https://melz-feu.ru/upload/79210486497.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/82708074934.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/fifam.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/29498264125.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/10151488484.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a6c2f1c1d---xarikofunawadibozolapopu.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/25698116555.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/39300512044.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e530283b3---pogolorufute.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/cdsjl6k5vsi2lidn2citn6hhv5/janesijuwefez.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/wasedurevedarusoralu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bf46f3060---21043563176.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f47e11e2e27---47780592402.pdfIn PDF document text
    • http://mobitransjogja.com/files/79262758951.pdfIn PDF document text
    • https://medlineplus.gov/kawasakidisease.htmlIn 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_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 10644 bytes
SHA-256: 132f601ba87c4dc10c0a3ae3b7f6192ff7dad420c10ffa144eaa67c0df53dc57
font_01_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC9 16744 bytes
SHA-256: ef3d5046af1b0fab4c7e58404f01219767c5fb7001336303be50e2d9c8778b55

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