Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bca087a3168624…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 23:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad3f9088a9ae7d85cb97c8cfcc6986c2 SHA-1: 310cdaa1a67dbfe2e783797b7afd956aaf31ec5d SHA-256: c4bca087a3168624cf533b7d93e32e1066c91559c9514e529e69fb488cb0876b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to manipulate search results or redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://aldo-ins.com/userfiles/file/93062841110.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/2936815072.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ae65ca309af---55150717571.pdfIn PDF document text
    • http://xycrusher.com/d/files/14749259219.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9852b3972627b4847b17d2d9447d2670/loxerebivaze.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/dufezinipabere.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/68226020016.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd28f130a---24754735760.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/23549878065.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/bazawilenu.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/78792734326.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/53295152798.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9de8aa02e---63719990614.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9f0db0a9720884c4ed90902c61733ff5/wunomenuvokitole.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/2531688826.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/zogugitararijigotizetu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/u5tvh81kb1so58egu6ulhq52f3/28514915316.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/95905445495.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/95435114355.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/fisibutezodarazanarifume.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f8666b11f---88104631616.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/16557921121.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/46240895259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=riptide+lyrics+pdfPDF link annotation
    • 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_off0000d24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24C 18500 bytes
SHA-256: 8fcbb01af4f24b17fe8790c1ec727b1d12e943b69d8eb1ec33043ce2b679ce04
font_01_sfnt_off0001010d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 10388 bytes
SHA-256: 6347ff7d5df4b4cee67f8073d31e1bc42995d4aa651c5746eb20b11e6c99683f
font_02_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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