Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00625fa3a03554c…

MALICIOUS

PDF

90.1 KB Created: 2021-07-29 17:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be5c21ac593196cadd98b1649e11fd32 SHA-1: ee6429032f3e97677d10cdb7d03082ed8dd6ef95 SHA-256: a00625fa3a03554c2faa7b0a0a0208c4bd9cd62bb49b8e24d049dd9f33a9ef64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier also indicated high maliciousness. Several heuristics point to the document being a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mtmnetwork.net/uploadEditor/files/52530529679.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/tevukgqglk39bn2ievqojtir6q/luxanuwazolatiz.pdf
    • https://tkquiz.com/userfiles/file/65435899429.pdf
    • http://www.toptehnik.si/images/62957390959.pdf
    • https://cplastik.com/data/cms/file/53873758966.pdf
    • http://pusancard.com/userData/board/file/2725250707.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/vamalo.pdf
    • http://controlsystemco.com/cache/fck_files/file/polebi.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/mq7pn5h2s18kg3vleo5m34u1vq/35389831436.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd75422c30---11132345285.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/44e8793110626d490fa7e2c78a70c4fb/zusefumo.pdf
    • http://studiosaletta.it/userfiles/files/32144936191.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=memorized+speech+examples+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_off0000fd01.bin
a644d3e5c1aeaed740e1d76aff40d76c780c1877b35b8d4df76c7830f5583169		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 17144 bytes
font_01_sfnt_off000129a4.bin
49852b4d832b7f6a3ff76f718f1335392d7d070791bb3b46eeda9dfea885a129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 10840 bytes
font_02_sfnt_off000142b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 16792 bytes

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