Malicious PDF — malware analysis report

Static analysis result for SHA-256 254e58ce4eebdc4b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 12:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 971d4ad605f984d8c37d5d8f9c981b39 SHA-1: 19c8811a898348c2374be2c04ce49811e43125b7 SHA-256: 254e58ce4eebdc4b3d89824c81d768769251ce916783812552c3108cdc8c450e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cbd8e7d161697b188f3bc50494494a0d/57298667508.pdf In PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/49226307810.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129dbd7ec0f1---27881051852.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160910e0b00b2e---11592042100.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/574d21018eb46996e69ad37ce9410abc/5869133212.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/jesaseguv.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/volekorukemunibiwize.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/32844055539.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092eeea88e47---19958192861.pdfIn PDF document text
    • http://foodchemsino.com/d/files/nuzagep.pdfIn PDF document text
    • https://primer-spb.ru/files/files/dizanilexufipejak.pdfIn PDF document text
    • https://abeess.com/userfiles/file/787306109.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008a12118d1---47395911164.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/larixevogutaliwa.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/58238481639.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828d75d6a12---87594053086.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/vorure.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/36970437025.pdfIn PDF document text
    • https://zold-kommando.hu/files/71076697965.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/shdhk596ltdnc00hl4sl5t38to/66216286243.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/98579239124.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/87039618604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pittsburgh+over+underPDF 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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 18640 bytes
SHA-256: 8755ca74c828eea03b5e44b1c0858434dd691e0cf1a7781e3b543c212440ad29
font_02_sfnt_off0001256f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256F 10628 bytes
SHA-256: de56572b02bc5db1275d9e2aee4fbdcd5a70db008640b4d00df7bf2a6f1169c3

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