Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aba729760ac0918…

MALICIOUS

PDF

80.5 KB Created: 2021-08-09 09:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90fe97683b7318c74f0c4ef24a8b10bd SHA-1: a0332615c3de823ade81b2de8bf71aa977d3c22d SHA-256: 2aba729760ac0918d5e8adf6eea1e425ef58d32fedd9b0ebc3954575fcec7172
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.firengo.com/userfiles/files/vejute.pdf In PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/b04iltp9m5qra1s331cjfju6o8/81529390664.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jalapaxivereri.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/gexitomufufesuruli.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084df70404d3---39890710826.pdfIn PDF document text
    • http://jcpingie.be/public/files/kazanaxodesuziji.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/bezapifopuxutamifokojovuw.pdfIn PDF document text
    • https://t2sc.me/userfiles/rusupigekifakilas.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e420bbaf38---dafilefebofi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8d9e5224c---12564799699.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/15744395440.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/0ea675eb1c76a3b8b8d1ff2d2de7aa58/2571077878.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zuvibupa.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a089cc042d46fc92b79bc3af2e3d7568/44037468686.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/fuwedabanepunaxosofafik.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/97428162430.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/8ja254v9vuus5ujjmd9odl27al/41964069445.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/nemok.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd053782d3e---pupuvosipemiguf.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/nkav0c0jib96t5hlsf9b3okl0v/fenetazazom.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b3bd079c966be1b878edeafe36b02805/94957723602.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a84bed8e160---riverexazetoj.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/40754031005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adding+and+subtracting+mixed+fractions+worksheets+pdf+with+answersPDF 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_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 11520 bytes
SHA-256: 2d84dfca5f68a92e587f405bc0b6e38beecccc34f9712196bf68194f75fc277d
font_01_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 16676 bytes
SHA-256: 2eb4a4d91544683926b13c5496c3d94658a2453b1f128103afd52b172e51dd13
font_02_sfnt_off00011ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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