Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2e61ae9e555457…

MALICIOUS

PDF

72.5 KB Created: 2021-05-02 20:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3301b503c4b02eb915137f72f1f5bb6 SHA-1: babeb5e6b673b3d535a0f829e631551c3d80e6ba SHA-256: 0d2e61ae9e555457ddfcc90d518d9fe7c3483caa4f0b9b8b9a41fdc3bc7bafe7
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a phishing or malware distribution scheme.

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 http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d866c919857fb573994309d9013ab3b3/21709598232.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081857a1c180---pakamafizaturelidusu.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083868994740---wokaripipisuzuguxavej.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608581f23c9c5---nubedojigalemewo.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e30694964a6ccab88ae1b21d2792a5a7/bubuzumepalurafimu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926b1eea8a---1323671204.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071f538d48b6---lajejoboperomoxi.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3ad4da17---52867711783.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/194jddpm2brm7hqgmdorrivmi0/72702266272.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a07d20be63aa71a4980bdbfc9da6e6b9/vagitekerukodisivanipelib.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d030ee39---sepokoxaroxapitaw.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c9be42741---xemefexesopube.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818b82575ad---53159833557.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7b44pf8fulba21n1d55rsr63no/raribafegufedofugi.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12fce2433---51944916836.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8iup287vthd7o89nlj4hpobtd4/83713255438.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=picsart+mod+apk+2019+free
    • 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_off0000d08c.bin
9f5c218370769c779d483d4af0bca7b451421ce3714bd1b2836390f03c06f660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 5816 bytes
font_01_sfnt_off0000e44f.bin
563b6a08937b8793dac91e816619d2657651a2d932a607d0ae647e2b52b87bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 21872 bytes

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