Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf913d52efdde3c…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 06:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7f5733460cda774bea35a425cf677d2 SHA-1: 05d79ef56339503c9b65f691994e10caf3a0bca0 SHA-256: 5cf913d52efdde3c4ad969d589166b8b5237eea81bdc7377dfe0f1e72a2f7f0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The presence of multiple links on disposable hosting and the use of UTM parameters indicate an effort to obscure the final destination and potentially leverage SEO tactics for distribution. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external, compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f037b8cd67---daduzovukofaxur.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081207c29bed---kasiraxazatasiwokesukor.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/42b73c8b58981e43e865b5e78a749676/bumik.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/46205463441.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160caae0f7a324---24835669369.pdfIn PDF document text
    • https://tsegypt.com/file/72692777813.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/futujeza.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802061ad526---sululenutozidowokononed.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/afe0e8e8673dc8d2465e64e60b662655/pogedositasipa.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f2f5eb53e---79172536128.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/734f4a2bc1031996bb59af7486b28b43/26648247393.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/70807979279.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd69995b73---16794477653.pdfIn PDF document text
    • https://rivnerun.club/images/files/zisabuj.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/sadizi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/30223532678.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zikilidovupunodulodupike.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa812467501---55914612183.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nanagabiropukomijuzosemi.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xegakag.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/197d3744f22932fb4b20918e25d28d3c/xavakaguwixelanamixetataf.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa476e3196---41027618678.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/o4fvol5c2dda7d77u2b7ns0mta/60643919633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=inpage+to+pdf+online+converterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 17000 bytes
SHA-256: 08b900cfefb7a7a5ea3aca2b199789317b2dcfd83caef25d493ebbfdff0b24aa
font_01_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 17112 bytes
SHA-256: 885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
font_03_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 10644 bytes
SHA-256: 8707ef136c893d200f52abf54d79530057e48cdfd3045ef61685c7e7d5604b06

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