Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f61bf328a563ad1…

MALICIOUS

PDF

75.0 KB Created: 2021-06-30 21:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7384823e3da0ce90bfe39d8ea8fc5687 SHA-1: 13ef3ccd5160e8c91c42e62fac06bab23fdc3390 SHA-256: 9f61bf328a563ad1ecc6bff1f5a2cdcd9635c5f3a64ba8beb16fdd4e0df4fab0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites, likely serving as a redirector to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f22bc767d55bb0af921fe0978284635/44237612473.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b2d0afeaf---vopawagupubokunoxin.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/36541535524.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ebdba5afb9af55ec107e77cf9d3ff3eb/lajagutiwelalojepezi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sf6tmra2knbbv257shfoi0gqid/95201660165.pdfIn PDF document text
    • http://nature-revive.org/files/file/96941160708.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/ruwadagovukapunupu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1656b72edf---46823155519.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16087a13a9e3b3---nuparenutovo.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5569aafa193daf1dff2daa8cfca8a48/fabibavedalazu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608284bf86582---samuvalejewekumavi.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16075860ccae17---53373525886.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/fef6e3b2cd2eb757a60d929d3bd016e5/57009873028.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/kktgcqo8gp2msavae0vnjmpl7b/pixovemaga.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/he7447fj513pb01cvuuk0kv3nh/89728793881.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718cbb02725---55980853070.pdfIn PDF document text
    • https://kede.org/userfiles/file/56220099778.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb7ed6d78a---pekizidagugibureloja.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c2a7580e6d3400da3d58f76cc55458c3/veparubilamela.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/27594732856.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/64937134442.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/nerokubis.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9aab854491afa042caba00b3c0d0c135/90989969795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=words+that+start+with+crPDF link annotation
    • 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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 10264 bytes
SHA-256: 7a44b4ebda6c962fb02090737e5e1948afa582ca41628c931b085641777963a6
font_02_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 17352 bytes
SHA-256: ad315d9c2fa3db86f12f225a2752b3702565f81dddd58577b0a7c9732ba8a53d

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