Malicious PDF — malware analysis report

Static analysis result for SHA-256 274da475b37a6357…

MALICIOUS

PDF

90.3 KB Created: 2021-07-05 23:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f6ab335ab5c74f473f1aa33f1afd0864 SHA-1: 3822096e457e4afa9393a3ccaf54e10453530b5c SHA-256: 274da475b37a63573797c1e6fcb2db5df4f2464fd3f397db712f42b27ce48a4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, indicates a likely attempt to direct users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4c0464aaf097d2659d27e64509b0d348/18533183379.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f9ba48522---libexosukuked.pdfIn PDF document text
    • https://susta.vn/userfiles/file/gujunakokuzinuziji.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/t0mbjho0r35iv75mf2hatpr626/lorabikuwepejojop.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/549d42c4ad5c96750a60b9b4e8082f68/99947210619.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/pedasu.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/gevatuvakekemupalaritibib.pdfIn PDF document text
    • http://dhf-china.com/d/files/gasoxe.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/todegitobizigexi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/658e5965572232e1a63bd62458712de5/86570243917.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/tusokosaropupogiw.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/38064145993.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cnnhi0e61tpe1ul47758drscm6/dezes.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c7f21c48---larijoganulamavuwox.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe5f8f3a0---ludisogipa.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a040c5bc3dfc10d5b6e118176190b675/pevigi.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/vopexijural.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc715d20524---wuxeluzigumir.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/5182888599.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/jemokuvidonivalalob.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210701142310_9uh2za.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/nopatobigakunuxotar.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/tamamokajafovabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=painful+sore+throatPDF 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_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 10412 bytes
SHA-256: cbd819927aae7209b383eb40832c37665d59d9d281d89178d79fcc7ea404b3b8
font_02_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 17000 bytes
SHA-256: f350c354ee23e5031a5fd568e45d05ad3e17f16cb8a0cf9f9f19c80688ad4c50

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