Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a5690336e7a615…

MALICIOUS

PDF

91.9 KB Created: 2021-07-17 22:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15c81dc0065faff1f17adf774da6af6f SHA-1: de429674b4e0b97d19d831a22e85389184d2b91c SHA-256: c6a5690336e7a615c88400bb842aeddf1d71647e6a5c06ae8ca3f31d5fa2ee4c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://fandimnarodaku.cz/upload/file/suvuwufelamufovexesi.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/63283719855.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2e6c8535---weridudejujidaxegowo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2c599349---somalisamofasirufekuru.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608548831f816---5495454014.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d5a4f027---muzelaxa.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/56252085177.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/51437223883.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb079e9c7---72395042532.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/58805263739.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/54897233460.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b44ktkavekmooba92j6q8h99s0/99297497117.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jiwutedenetija.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b0457f02a5f.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/46da523de3ab2fde97606b4aa3056003/zadut.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/xitozifurisa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/c32ec6cf18a4b349e6a8bd0925180328/12861614810.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/5a6c75a7319f0fcf67d180b98a2a85e8/lisenobodolebojilename.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/7fd1dda6dc25f0c0f5ed9cd1e1d82c11/77214959116.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/o3t2nntinht46h4irdrl56dss3/povetoxopabixapu.pdfIn PDF document text
    • https://bloomeng.com/uploads/4162723627.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/orpeofa6ct2tcho696kcb0fvn0/zaburepufa.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb946bc440---tevenaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+quiz+and+answers+easyPDF 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_off0001056d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056D 10460 bytes
SHA-256: ba163192cb2525df7395a0fb20e1ea82a04b86f15d1015ecc832cb8c6a5dd709
font_01_sfnt_off00011d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D18 17376 bytes
SHA-256: a94bdc2d728e230e237c2cd4d4a3374b1ebf3dc8a3ba4b3201f4ffb084c9d910
font_02_sfnt_off00014a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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