Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7cf090308b921e…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 17:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d6fdd9350041e01572edc0c302e5c9e SHA-1: f95c502c921e063a4ff5319b14d87f63384b4f79 SHA-256: 1c7cf090308b921e2744d5dcfbd41d5b11aed9823067de894aa1d386f0139d67
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to manipulate search engine rankings or track campaign effectiveness.

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 https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/603bb9646b7e31bbfa01f0cf8ad34e45/fafeta.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e020cc825e16592a8eb07aa4a335d9ba/meniziximufalakifubokoveg.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/80e92fc7f7a3048c95fb83c99ee711dc/19501757280.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/sufizokutor.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/6976195899.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021828746125941.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/44528394929.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/gineforipigovibuwizuzite.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2m6j8fkf1jae6h1er4n6grmul4/95414192599.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16113320ea09c8---13824546241.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/089sjuctphrhinbhvopi2aogh4/78738406908.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jofifazamegugoseli.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be795fa41f8---39438343134.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8a3e6c6753a728c1ae7157acf67babbb/71499102858.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89661acc2a---butekuleruduredukewibezow.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612d92a5b8b90---tegefananebirejexaziwa.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210723101732_o7z5za.pdfIn PDF document text
    • https://andana.us/files/files/76811589837.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/95c9a03a08a3569000d9da64ce9eaa2f/xokajarawebuxuligivilig.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/siwex.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/86116518634.pdfIn PDF document text
    • http://ridendo.cz/files/file/xawupejodeveki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2013+hyundai+veloster+turbo+repair+manualPDF 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_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 11444 bytes
SHA-256: d98e493edb3fa59726dbbbb6ef606e38a8ed38b01b5c926d94cfcae8781163a3
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 17628 bytes
SHA-256: ffce81760dd80f1c3a78cdce1430ae63f83464c0cc43d928af04c84eafe1cc08

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