Malicious PDF — malware analysis report

Static analysis result for SHA-256 3beb22eb394487bc…

MALICIOUS

PDF

99.9 KB Created: 2021-08-09 12:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da6e9438ea1664d0281c1162e867dce8 SHA-1: fa72afafdb13802d61b1390503a0acd9dd43d875 SHA-256: 3beb22eb394487bcbc817ea871e4ec8f913a0eed33c2cb9b271e7eee8327c7c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests an attempt to obscure the final malicious destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wegofa.com/userfiles/file/xewubazegudukevumevo.pdf In PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifigijuropevewu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/tinotekatefozosunafixa.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c635290f77e---lexuzuvobewobuse.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/fb93ed7204fedab10d4fa001d59bae13/rowenuzesivu.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/sopidixewikokukuzug.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/1430650881.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/fiwofiruzupubodesov.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/75369630973.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c9f2f152eb230242870159645ad0f086/besabuju.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/r6orqn5fss279iqk9cv884ik5b/nenotikogagenu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7081652e58291c6f4cb77271bc6ebbbc/21471455917.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4e42d8c02cf6167f196c32b7c810c7cd/rukutufajamukulatajazu.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/21722895537.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0a273de8ff5a0750fdb4e68b976286a1/39416368663.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c972ee28de---88727898430.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/nokibanufe.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6e8c43b87fda4fed43d897b44897a571/fuvuja.pdfIn PDF document text
    • http://hkalc.com/userfiles/17494597387.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/78162067132.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a5246c64b---30551433133.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qjlsp6apirh8103lmp8ve6vl5/rofevamorarasekuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+fit+a+fluorescent+light+starterPDF 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_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 18768 bytes
SHA-256: 411ded9cd724f75132cddaa4496e8945ccf24026d1404dd5db779dad537ea528
font_01_sfnt_off0001506c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16883 10792 bytes
SHA-256: a874f2cd062e769feaa521449e81339d9154e9dda4582d80ceb403492b4190e6

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