Malicious PDF — malware analysis report

Static analysis result for SHA-256 20446001e67421e7…

MALICIOUS

PDF

75.1 KB Created: 2021-09-04 21:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb019cb60c38228d806bec5accefc495 SHA-1: 1f0db97ef25fa4820c3a37512393f6370b2b1116 SHA-256: 20446001e67421e7615785eb2b66093eca14d757de23813a18928867d024a22f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610df8f9bbef9---29542576558.pdf In PDF document text
    • http://firewheels.pe/userfiles/file/xexapunesiraxakadexujepu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d2c5b4d41---gavejasekitusuxabebofaxin.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/xetixisuduleduler.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160791743e6a73---69446917923.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/zexuwuxeket.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/88055563737.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lckcj9h5qbhvnvm1pf49dpi3p4/kesenotipal.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4d1b4e83---24851854370.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852e343ee3c---pupukokuvusozabezexajow.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c767a4d334---muxudetibodawugevogiwus.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/46699700923.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/50446924235.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794929b870e---wowasifivifibagogefi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5effc68fb794c38ec55458349f4f0868/33545910666.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/87585844211.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/3254626977.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/uu7q0u25q8kvcjjal1akvchmpt/jixupotiwegoj.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/siputariwiwusop.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/dilozazowegagigexo.pdfIn PDF document text
    • https://bak.vn/upload/files/xazebaravefisudifesem.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/72690737264.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/12357213236.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fa72eaec---2411041470.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/8c578a997d0f145c247f45c5accde8df/18384062805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mndot+lrfd+bridge+design+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_off0000c2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 10932 bytes
SHA-256: 01c0e1474a2e582cd695aebb0039d59524308fff5096419be77c570411803403
font_02_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16552 bytes
SHA-256: 4347ec0d3ff67382a4fde57f53589798227a219d4914461760c4e0398fec5b0f

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