Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7b70b59f384438…

MALICIOUS

PDF

82.4 KB Created: 2021-08-19 05:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 99818e7426cf3ce5df1d7011b41076ae SHA-1: cfc862443d0bf02ca52e1dda27155477c5002cc9 SHA-256: 8a7b70b59f384438eed8e87dd3a20b4295ce5e012f52b5dbe51915b6bba0d07a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726309d220d---fegowusilemefibe.pdf In PDF document text
    • http://mutamobilya.com/images_upload/files/xibebegilobazojavaxuno.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf4979a448---58390405256.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/gorutijugasasu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b02afa71d31---vafikekam.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/lapajebozokitegefugerutid.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/bufepube.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16072be38dc55c---jumojupaxozegazozamumoviv.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/91368508224.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b43312c1---gijukevukiwosekixedaku.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/db914d2f7e8e9a4c68f276b25e0d79f3/tabikulevexe.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/13143883855.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/0b9eba74c7e2f9be232f913155c0f2d8/69771929880.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b43fca6ea7e---gevuputeduvope.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/adfdffb39afa1a6b0b1b76be37ef87d5/86907960911.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/zawujazuxesegu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84c2c8829---15754760212.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ff45b9980e2ecf03046138ca8ccc3e72/bujunuxe.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6f3b506ba103efc7fa18b31c33fcbd18/jusafosefebez.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xamopoxu.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/68580226347.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/41951028701.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d066abd0761---11549856342.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/12241058465.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a385dd78a---69834606092.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/28054180127.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/bigerumuzofil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=farmville+2+cheats+freePDF 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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 10540 bytes
SHA-256: 2d9c7332360e6eeca8dde3c9bc747008c4964501ebe576566587bf0c5973f2e7
font_01_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 16264 bytes
SHA-256: 9466daa817d582d317cac21e8d712df473d85d04fd9c3794e3e4edd1e4cf49aa
font_02_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1