Malicious PDF — malware analysis report

Static analysis result for SHA-256 f927ffff1caa3607…

MALICIOUS

PDF

95.4 KB Created: 2021-05-27 03:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 593430772dc469e9c1db442ce08438f2 SHA-1: cba2238379db294f12bd86271599e13def6e333a SHA-256: f927ffff1caa3607057135688606e120961ed43171aa97fa1d35c9b2e1ada688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body, though partially garbled, contains text related to downloading games, likely a lure. The presence of multiple PDF-specific heuristics related to URI and link farms, combined with ClamAV detection, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/uplcv?utm_term=descargar+donkey+kong+country+1+2+3+para+pc+portable PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ei992ls73bf64narpchn3954i9/40010804408.pdfIn PDF document text
    • https://avenue102.com/uploads/file/18090683798.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f2c23d73---lomezutonemubosupokonowur.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608188fa9fd5f---lusojob.pdfIn PDF document text
    • http://coffee33.ru/archive/file/34069018730.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/88bfmo5dsahg9s3rscpq7k004g/86434656749.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/m016n1mpnqjmdbc2ostdu05fq7/82994155161.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/61883228815.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c667c0765c---gepubis.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/861dabeb40c357dd90c39a617ea05b7f/43563787119.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099d37c133e2---2858598788.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/595099046.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bccfe189c8---naxukovesosafot.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a70f62967e2294d3577009de5d3196ed/81267766867.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c41550122f8ed641574767d44891ba83/tetojidukesepawusizif.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/sovigikilifejuf.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5dbcofnnlholdlblco4f8103bc/39413661767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00011d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3C 5896 bytes
SHA-256: 54d3a8adee7a1882c77a10209d03610c8016db2e86432c19cdaa406958ff69f3
font_01_sfnt_off0001316d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316D 11992 bytes
SHA-256: f7c421690fb96ba0507509db70d6cbeae5e0c471201eeaf257dcb59ede3f4f51
font_02_sfnt_off00015939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15939 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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