Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fd50e108ccb68b…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 22:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70cb383cda2bcad5212cddd2f47e1f0a SHA-1: 6ddd3d7c18c426ee107eb06256868b02246852ec SHA-256: 05fd50e108ccb68bf939ab5101be3be06336cbee51ce8fe1d973777f4c9c578c
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a lure to install a browser extension or update, a common social-engineering tactic. The document also hosts numerous links on compromised CMS upload storage, suggesting it is part of a link farm designed to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5a493432---23503672993.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0cad7415---31361018006.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073a9e8b6f94---vatura.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d967344c---24226384329.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a31be27550---jojuxoboditilawekeligusi.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/b508e868bee5d0f0145b5b0593ee1ded/lobajevufesi.pdf
    • https://agronlogistics.com/userfiles/files/51045617551.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3670fa87eb---xowefexexowudagunejujila.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1ntaapl5o8829j75n8lgd7seq7/39262690981.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ae61fbd0252---55347249321.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/534g6dj13i6jbv9r76l340km72/91450060865.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075935eade3a---108682528.pdf
    • http://artecgroupservices.com/imagenes/file/rijelafegoli.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c1362879---beburufoxepuzoxewo.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1353b92e9b---nojojunevuzesitazen.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/gorikasadakotofu.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774e306dd60---jadipisumojusanajopek.pdf
    • https://ascinfratech.com/clientprojects/trading/file/mixedediv.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/70c0cd1b27b7673a9fa4316279ea981d/panuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=financial+customer+internal+business+process+learning+and+growth
    • 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_off0000e737.bin
b476f44437ac352b21187a188e29400e44711313a6585893212784e2dcc20493
pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 11264 bytes
font_01_sfnt_off00010111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 16792 bytes
font_02_sfnt_off00011923.bin
996afd6bb2aa8058c11ae4f3b3210e63b0ea9170b4cd48d5fe881c367664d285
pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 16844 bytes