Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc7cd980c6ec063…

MALICIOUS

PDF

88.5 KB Created: 2021-08-10 13:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03a021b2d176144635ee50d462fe10c4 SHA-1: a7a360fc146d1c3771db30df1c601e32dcd38f2d SHA-256: 2fc7cd980c6ec063889ef697bb7be60a468b9700366ad46642cd0e0c6899483a
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, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://inwebjor.ru/uplcv?utm_term=world+history+semester+exam+study+guide+answers PDF link annotation
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607051d7aa63b---kalusanalukakejejesu.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/817065847.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/70836693909.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081199728076---70374975305.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/lumikeseworukuridodeko.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4af66de7e---70088980958.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd50f5379a8---25391893723.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aa55c6be4---41341494615.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/putufobemuvilage.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/83057107667.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/a743eidaq33r13mvbcffosvls3/vivagi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/715f14a70af8d8b016c80ace7247a793/zomoresovegetatutu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/c15aaa13a41d9be1c17ce77afd81252b/15842673850.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/77651549653.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/17358664696.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kuvamupibemojerepudo.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/35679331232.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/tewesizelimikuvagulite.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/dobodarogatazexikunalu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/5004132237.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/74348545851.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d4d2419b36152bd72acb9b9b2c9cd332/92840778600.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/922a8449fb58f586f5bc74eaaf3b5cd9/xubabaxu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16092c40e714c0---69733876880.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210804/16280223405548.pdfIn PDF document text
    • 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_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 18056 bytes
SHA-256: 61a9254ceb6392279b3abbda9823d708720bf15103b8cbb77c9a51c696c545c2
font_01_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 11092 bytes
SHA-256: 9ab4263fcef14ef7fb93da7f648ffd6e21dbcf5cc84b9169aa0e23f1579141cc

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