Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc932445b46f247…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 18:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 654d0dbf38f09a198948d0ef590c35ab SHA-1: 866cf6ceeb2d56a8a303b796d7c736002762e8ad SHA-256: dfc932445b46f24711a5f7bd7e522b3771b1fb4d4c70b76fc8f4d2cc5520bc28
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088194c98dd5---zatafego.pdf
    • http://odpadykj.cz/UserFiles/File/73235393760.pdf
    • http://xboxheerlen.nl/userfiles/file/18787727787.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zeguxosetil.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c540f9b09032c323fb967fdbf7be4a65/bemojaba.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d37e49bf93c---19417689913.pdf
    • https://vvpta-irvine.org/userfiles/file/zefunenumurapeluf.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d1083497585f4420d1ed986f1ba6f09f/38803920158.pdf
    • http://jullien38.com/ressource/site-image/files/gitofivigiduves.pdf
    • http://rdmsrl.it/userfiles/files/43110078161.pdf
    • http://zuche0551.com/upload/file/parojofevivewomore.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814ac741308---91389829862.pdf
    • https://alakharia.com/public_html/userfiles/file/foxorufopuzuzapewize.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c221dc181---79748681525.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160785bf1260d3---28207341387.pdf
    • https://aduanaldelvalle.com/userfiles/file/sajatalafetin.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ecc29de473052fc53ab573f8de2aae31/13116619536.pdf
    • https://10glazsikeyrosa.ru/file/botidumowevuwosezoremaf.pdf
    • https://advantagelic.com/singhania/downloads/file/rubexove.pdf
    • https://readandenjoy.ae/userfiles/files/zuxizo.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776c9fe124f---73894446222.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/690dfa3e990c5e70b78347750bab1e74/sodemomilivamun.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/47cvi5r0fv5ffvpuf5kk0si26s/55286879839.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607037030f361---fuxubexogagogukata.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/9a1d8cc97646a1781e37196fcad1d68e/56729231802.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=daily+workout+routine
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe89.bin
455ae1a1752b3b3cbbad059eb2901cd4cb8671662a83705d42b763b7bee3ba1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 17360 bytes
font_01_sfnt_off00012b02.bin
9376dbd0321a710836413a0a400fb89d148d2f9373f522f22aba92a4150f481c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 10324 bytes
font_02_sfnt_off00014278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14278 16792 bytes