Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d97f7bb0c58de5…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 15:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5c0e83b80d2a1b37450a2972e187093 SHA-1: b47559ea88dc201b694b2264483ac615c742bd1c SHA-256: 20d97f7bb0c58de56052b219d02827098fac14aead63274e813b3ef1e040585c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites. These links are likely designed to redirect users to malicious content or phishing pages, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160caa8825e208---73848539289.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d7b3b7d2---toromenuzux.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074a65c71dcc---59907335918.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/51301734059.pdf
    • https://aduanaldelvalle.com/userfiles/file/5192212618.pdf
    • https://brs.jo/userfiles/files/fobegipixujupis.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/bikibog.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/60f60dc4a0b6aa2cbcc1bf8601b379cb/93804511662.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/24210b54e5f4f95eaa5eaf25bb0c0c5f/13363409396.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9c3da85f77ddfe165e523f763e451988/9062099896.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d1f63e92---tujizesowegozusopixew.pdf
    • https://actorconseil.com/files/file/kosowenufuw.pdf
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/44409748808.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/xeboxavifif.pdf
    • http://ldbell1965.net/clients/85689/File/lerujezozolakiv.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb9da7df8e---53608339403.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8752d9c08b---misalutijefo.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856229f0323---nenupefasodoxiragi.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1ddc0c12d288ebb42d143ed80c079342/47010167552.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/3n71quov69ql6i82lkgsahltng/63122625218.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073adee8da65---dixiwewivedofe.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b603e8b8d310bd172324dec0884b5fba/19993570633.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078091a418ff---pulidu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+witching+hour+augustus+thomas
    • 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_off0000ebdb.bin
48344210766fdd31a9757796158c25679ac5ea4d3ed6634154b45ffe6e8ae509
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 10780 bytes
font_01_sfnt_off000104a2.bin
614aa3337fd74cd5052ab5666fe05626d556ddb4f72b74344a87adbd45764a2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 17384 bytes
font_02_sfnt_off00013222.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 16792 bytes