Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f37d70516d09079…

MALICIOUS

PDF

87.3 KB Created: 2021-06-08 19:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05583f323c26de3e402665ef460de326 SHA-1: 7cfa3b1b7e510c8abef01572ddf24a436289cbc1 SHA-256: 5f37d70516d09079a1a4029fd6ab659a8bc44682abf26aeec0a0adcb4357a282
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall detection profile strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=gym+report+card+comments
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/i3n0smjh967b47ivb2cdt2g2vv/21451824036.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ipu3cjac91ejb23av376aubftt/43918053846.pdf
    • https://amitadevnani.com/userfiles/file/42675342418.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff2434c3e---61405691274.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084073e26a78---5372412050.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6a6577cc009a906a87ab85880be7cfd9/44242983269.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/527bddb5e2a9cbecba51f59fa0f178e2/26570352418.pdf
    • http://cnc-soustruzeni.cz/files/file/pazitoporewomerimosodisaz.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3d49245b7b2b2828a740309d8c3d4ca9/dubonijasazanogijipezewas.pdf
    • https://ludifrance.fr/userfiles/file/jemadir.pdf
    • https://mytopics.it/uploads/file/xodotitudekuxelif.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a50bd3021fb---mimovugegalot.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/86b4691f488ab9bb6a5a774bdbddf142/josilopase.pdf
    • http://championshipsportsrings.com/clients/23492/File/putewitaranixosudaj.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbf818603---72512797501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b4.bin
0d5cb0ef92166c9b8f0883bc303c75ca07de550ec7a06c784d8441a15121e72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 5320 bytes
font_01_sfnt_off000129c1.bin
06c62a789fe70e9a333b4fdbd56714ef87bfb8a2d7e08a15e887bb3e5c8248c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 11076 bytes

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