Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f5bcd7f59cd551…

MALICIOUS

PDF

101.8 KB Created: 2021-09-05 04:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d95a40f7f3b7332635a2c67162e0cbee SHA-1: 6d61177c02a1b2462e43ad46ed1f6baacfa23397 SHA-256: 57f5bcd7f59cd551d82b8f81b4f9a96b01059cd3512424a5cb347677938f2de2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://timavoshipsupply.it/userfiles/file/89085162642.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16116ba8f1eaf0---71036725606.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4f1bb79cf604634a657ac6c581406c9/20825410780.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4ec7336c---91722175810.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b920f9ed5aa---77814153133.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1281552a6---tuxebelezunalugewusado.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/40a972a00fbb275371529d3b69f69418/nogusixunaluwokilipo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082387adf801---13601239552.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a44549ad9a204bfa8b1b2f091f3f89c5/58843195483.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2e29de2ee2d6bf39749d419c2267647f/tipameze.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/68465941411.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/42733167880.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210702_2FB9F9574A4CB0FF.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd1e48859---47390959581.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6kcrcfl8dao83v1nm0thlq2dh0/telesokobevimur.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3a60e168---sixujasukabunujesipedo.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/98760235490.pdfIn PDF document text
    • https://arerp.kr/data/file///80592593217.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/2183172847.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d88499444---31503836876.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/44797254286.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/17181473117.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5c191bb6---7336592615.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vobozirefudalajogitin.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/notizenipovize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vigilar+y+castigar+analisis+pdfPDF 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_off000128d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000140ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EC 10628 bytes
SHA-256: 74efc09be5c09e4728c3244c90f0b70c8f295957cd3ce45fdb2287ac842c601e
font_02_sfnt_off00015920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15920 18872 bytes
SHA-256: d1bbcb4b0880ac3e9076a44240fd15a285cc201ce10abb4c139bd9c030335d75