Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfde17219aed614…

MALICIOUS

PDF

72.5 KB Created: 2021-06-25 22:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90874f313f9f01e1a5e7655967498777 SHA-1: ec423de9cbdbb7190243cfadb38dde75141c7bea SHA-256: 5bfde17219aed6148d800945a1062c8e861885c70a6ff3d3f2a531dca5b20f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the nature of the heuristic firings suggest this PDF is part of a phishing campaign designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a824ce2176f---dilajipibuzi.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081981355c6f---muvokefuzanagad.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8ca03fe9---81639661181.pdf
    • http://bomtvplus.com/data/board/file/20210520195724.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/907ac316216bd6b2a0f4a85dc15ed85d/27855932256.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/99n5ukt6tg01v73isfprl9pioi/37222003453.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69aa4d9a1---23860229661.pdf
    • http://lohs69.com/clients/82366/File/xajif.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/8367ae2ecbf8a6a289a741b84ae1a926/laxalelasupuzasubuv.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc95ab14c4---nezinuxilujaf.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75dba018ca---71351431119.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160712a575512e---75419994156.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a919dadc173---56641141206.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f163dcd5d9d91bb5250d7385f2a79676/47714998414.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fcff63ae5---tapuxelovevaxapobutotaz.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tu0nasblcqlvj9nuoktl3uvhli/fodujidediwuzi.pdf
    • http://krevue.cz/UserFiles/File/20697045028.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d09a055c0bc514e9f588e9b44fbec68f/38269236752.pdf
    • http://deauville.ru/files/file/75771523662.pdf
    • https://majorsagilekvaros.hu/uploads/file/28703115722.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793c0779245---54934045437.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/160a6df84d0e50971c6454dd779d5586/75263058548.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071821cd49f7---87162489373.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a4218802---1011976180.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c772745d61---gajulizasizajiw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=earl+%26+countess+of+wessex
    • 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_off0000c032.bin
2dacdccbc5d734c5c5c96da23f782a716fc7e91f127b2223476e342e7330727f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC032 15920 bytes
font_01_sfnt_off0000e95b.bin
8b55743371e68f3da78a40f285eb2a5cf281449efdea40eef3d18dd44ba02507
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 9364 bytes
font_02_sfnt_off0000fd41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 16792 bytes