Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06182d5c4779cd3…

MALICIOUS

PDF

85.0 KB Created: 2021-08-16 17:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a4a3c91a9313aeb8a5ed5bf7ddbfb5d SHA-1: 57481811039de1a06e6cb11ed5475abda3024e10 SHA-256: c06182d5c4779cd3e90447b4f965b4d6fbf1c094390c21b37f3094df7938bf89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The "PDF_SEO_DISPOSABLE_LINK_FARM" and "PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM" heuristics indicate a pattern of using these types of sites for malicious purposes. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=download+ultimate+car+driving+classics+mod+apk+unlimited+money PDF link annotation
    • http://legalinet.eu/userfiles/files/rakoxewujurajer.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23dad6229---mumefokumizirabipirum.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/17474068456.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffbf7f29a---13509483508.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/dofopomunarotogufulowaj.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/62953448226.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/54289472271.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/88b30de1e46ea6f423927d3def5565e5/96325245654.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/01181ac857646c331f8c6eea4810bc02/tololigebavosatupizewoj.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/bijageliwi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/savujugasujakupu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/57474725573.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/87114041887.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e5b92868d442862287ff12950a7a4305/61016996571.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098da25f1d53---vimosaxi.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/86109369953.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd0a57a3f2---19839912129.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/66841188125.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606de27374983---43974579677.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951f5cc3b45---ledewebikeb.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/pubuga.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/40435310022.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/gumamikidilopuvir.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c89137ad9---99722343710.pdfIn PDF document text
    • 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_off0000e637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE637 16600 bytes
SHA-256: 38a374aa288cc6415501a141e576a007d17b1c2cf5cf52f91709788feb5e838b
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 11316 bytes
SHA-256: 7a8cd031523dd6b6127cd43cc781d9d6ce78025d939c0b54152664df5457ac5f

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