Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeda34fa6b696739…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 21:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 40342d3c4ea823ee22ec2f761a02665a SHA-1: cebcfc23c97bfe729f85f9ff8029106d4051c034 SHA-256: eeda34fa6b69673937931731f4bb29eefefe2dd64a621482fc8e8f6fc1eb781c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a3fe07680---99214068753.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7001f7443e---46482465159.pdfIn PDF document text
    • http://fittbike.hu/files/file/kuvozo.pdfIn PDF document text
    • http://cke.hk/userfiles/16585780340.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/20512497044.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d2f4384119c089038c04806e9cd870d3/23131398360.pdfIn PDF document text
    • http://greenld.com/userfiles/93198468686.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aabdf512648---52047660271.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/78246773499.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948d6235908---pakit.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/rosijozunujozewo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/40552410663.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/lamatunagawepanajazu.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/sunifoputevo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f4c8dffb---fezalizulakadove.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcf8dac4ac---guxirazanolag.pdfIn PDF document text
    • http://meskerjager.nl/media/files/votivex.pdfIn PDF document text
    • http://islandpointfl.com/userimages/sawasevezuwigukizib.pdfIn PDF document text
    • https://melz-feu.ru/upload/1377738957.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/607cc937e60af3db6d0e6df564583614/57314072384.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c40a8bfb5f1c24fbdb957fb4afe2b13f/81703290640.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9b6891eb8c45699c3d927361ebf432e1/670345277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bosch+anti+lock+braking+system+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 11468 bytes
SHA-256: a01e5e4fdae33b23d3ed4b17219cad33f2b6e3ec80ddea06dbcd9e2a150d8a95
font_01_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 17600 bytes
SHA-256: 0ae878604d4f31afda45aa822c5bfa8c2bc3c77babd8b80160fcb06c154467bf
font_02_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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