Malicious PDF — malware analysis report

Static analysis result for SHA-256 206b2bd331733035…

MALICIOUS

PDF

77.9 KB Created: 2021-08-28 07:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5402547e31b454ad02d72baf6f1ae76 SHA-1: 4afcc2cd04cf60970cb6b447e8789bc61673f5f0 SHA-256: 206b2bd3317330359d4375db8071e3d972f9e1bf2430b2741defc41e3dbc22d5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0892675fc9---vujodojagawodoremevapozo.pdf
    • http://studiotecnicolari.it/userfiles/files/pibozozokimotinizu.pdf
    • https://juhaszautovill.hu/userfiles/file/disuminobewixo.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070349e33e98---rolobijosegujewodu.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/7f13c518167ee7f9682559c46add4f84/98302992944.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c895ff4996e---17414915549.pdf
    • http://karpatskiles.ru/store/file/15234399143.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/gewezarutaf.pdf
    • http://www.awakohchang.com/image/upload/File/ametuwanuwerogiwemevevu.pdf
    • http://cs-web-design.de/ablage/userfiles/files/kisevudimadebobususorobis.pdf
    • http://epwuae.com/userfiles/file/vujapatonodidejavav.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b9fcfbfbabb9f6edc71d93c26561542/vibifa.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55f1697c2---31938865415.pdf
    • http://waltwhitmanhsclassof1970.com/clients/3/38/385e9ad2c098ba3bcab8db81b262ab1e/File/90729239676.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/27030954102.pdf
    • http://p-itos.net/admin/userfile/image/file/lupavaderotikasav.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2b31aad6efe914301f8caeb646f38f8a/29049978860.pdf
    • http://firanywiktoria.pl/uploads/editor/file/19043311268.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eafb76343---xaxuwininulegi.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/va0g90bcglntppk3pf0tpgupbq/38901426687.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/1bllbpu6l17sc7pnt36l6k63ir/kiteloxoxug.pdf
    • http://gesundezellen.de/neu/userfiles/file/20492069300.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983603baa03---16308545284.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=auditing+theory+and+practice+pdf
    • 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_off0000cd24.bin
9fbe071c1f34e22aa78b584ea7f23071fd5b7d044583806cb1db65a81d6bc26c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 10880 bytes
font_01_sfnt_off0000e612.bin
e71a0b6cd5c3115512b26361cd342ad78cd41e5c78b980ee0fbc75b01c8045d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 16304 bytes
font_02_sfnt_off00011060.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 16792 bytes