Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89e078579f1087c…

MALICIOUS

PDF

93.1 KB Created: 2021-07-26 06:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b619156bd4488ab42c064c9b292aee1 SHA-1: 5fd1c3114efd78b1fe7d9f0c2ddcb245f8c0993f SHA-256: a89e078579f1087cbcd98d89bb514e2895b8bbf20b9a61e7ebe57d913b19c770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the link farm and the PDF structure implies a mechanism for downloading and executing further payloads, likely involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a24dd17c---4698367552.pdf
    • http://distributoram.com/files/file/91592069307.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1e4b5e46b495eeb270227876a9cd35e0/fodizewezip.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/37d700a2809b23a14ec14be405b39cd3/31195880698.pdf
    • http://keiganproductions.com/clients/863431/File/33961671278.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc71cd5c16---44194024329.pdf
    • http://onellenorzes.com/uploads/files/95335751585.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/9f7bd9699bb104621d1ccb6f1766b11a/29364572048.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/11f7ab080fd22f52416f8ce2fab313b1/memosojem.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dae880f2780686b48adce7f783d53264/raxopavewanujuwozuwitam.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bdd59ef25bd7ba0b2898c303cdca10a0/rudunovufajivo.pdf
    • http://frigotechreina.com/userfiles/files/30804705940.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/xinotolekofoxawekumopa.pdf
    • http://sarljarry.fr/userfiles/file/ximenikefegatin.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc277a114---73168633514.pdf
    • http://tuzvedo.hu/elemek/file/nipemapuwuzugamu.pdf
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/teere87a3su6dn2grp317939no/85845647312.pdf
    • http://moderncarrent.com/user_img/files/39380390769.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ejpauhe2f8nuq7cg6bknhgv7fe/lalavoka.pdf
    • https://bestrecycledautoparts.net/images_i/file/dakerujozubepedaj.pdf
    • https://laserbeautymachine.net/d/files/mebize.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c19cdb36---12431552022.pdf
    • http://hotelclinton.it/userfiles/files/97080908714.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3527d4d5e34ddd62226d81299f20235d/lerarazexiwo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=parenting+books+in+hindi+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5f.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 16164 bytes
font_01_sfnt_off000104d6.bin
3f3516f521ff332be32d3790caf56ad8188220ab2d9aaac2b5f290675dcf1fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 11096 bytes
font_02_sfnt_off00011e48.bin
3db7c2e3f3bdea2153b042bb829c876cd547d93df0f621ad0cb345d294a8081b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 17964 bytes
font_03_sfnt_off00014de7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE7 16792 bytes