Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15da15d32c572a7…

MALICIOUS

PDF

69.5 KB Created: 2021-09-27 22:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ce614b19bb800ee4afa404f6fb98fef SHA-1: 9776d99027691cf45987b2760959da976ed255dc SHA-256: e15da15d32c572a784c13ef65cd2dc5bfd912f4dfc0aca1b3fa646a0d7b2cc5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links to various domains, many of which appear to be disposable hosting or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=android+apk+path
    • http://premiercontainerlines.com/media/ftp/file/bufopijobu.pdf
    • http://chanhungcorp.com/images/uploads/files/68987790390.pdf
    • http://bet-balance.com/userfiles/file/57952455932.pdf
    • http://smelawservice.com/file_media/file_image/file/boxaruxotipop.pdf
    • https://rosenstein.lu/userfiles/files/desatilixanitefi.pdf
    • https://callmarkinvestments.fortunekenya.com/callmark/files/fojorawa.pdf
    • https://wineuniverse.us/userfiles/file/kuwap.pdf
    • http://www.s4b.nl/upload/files/55172363137.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/71a80895844022baa7e2baaeb5c97764/5166948036.pdf
    • https://rent-1.es/ckfinder/userfiles/files/faxavot.pdf
    • http://mingmitrcoffee.com/user_img/files/8305183340.pdf
    • https://valleyrentals.com/userfiles/file/93978714068.pdf
    • http://bippex.com/filespath/files/20210924235045.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0cac98e312cda133b6103469a62f258a/levufituzul.pdf
    • http://kocavietnam.com/upload/files/66238366791.pdf
    • https://ximangcampha.vn/upload/files/fukika.pdf
    • https://ratosatu.com/contents/files/76904395289.pdf
    • http://lifeline-sports.com/files/file/fotofagekogabuj.pdf
    • https://gryf-wet.pl/ckfinder/userfiles/files/21776782105.pdf
    • https://aokman-drive.com/d/files/50974555246.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c322922f7---nejugowuserujeja.pdf
    • http://85560891.com/upfolder/e/files/20210909103103.pdf
    • https://drjou-vc.com/upload/files/vaxetuvugesowumuxut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aebe.bin
f04c5d4dd2c95e8b3314f364b323e0575a9db910c4ac3138666efb0cdb0866dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBE 16848 bytes
font_01_sfnt_off0000d9ed.bin
36543d6d3d3d69902a7feed6863354c935304b8c8336b7db86a126d677142551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 10216 bytes
font_02_sfnt_off0000f0ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 16792 bytes

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