Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bea5659c2a939a…

MALICIOUS

PDF

168.5 KB Created: 2021-06-25 20:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b691ee47dc901d289975dac799d43771 SHA-1: abaaba2e6adc0112e91425184ef0996e701e18e5 SHA-256: 98bea5659c2a939a580e0a113cfabf10b6a0ed2e9389a10d4f2d542a30bb9a78
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9103

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://say-international.eu/userfiles/file/zogomovi.pdf In PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092a221324e2---pamotolagifudeguxen.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609679c72320f---wifedarefotawonomipe.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/65847781003.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/p50tpaq0d7h98ah4j9mtb89chf/69389862812.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/gevuzukusuwusetagotatu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/btfr3msm5913rbss6g279q87p5/37168008529.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3b473906559e12c8efd53990642cee68/87967415744.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/boramewazokagegip.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/514ed4f5ca89fe62e8112728fecd3511/56126903717.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/377cc0c934d3c7acf0b3bbf4efa6e037/38832649464.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/vudulozurunox.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/20550313219.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/49176831660.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/54067617446.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9aacfbfcb0fa23972c41579e12aa893b/88283050299.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d4d9e094---65199069626.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797dbfeb287---mukukemopufenop.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caaba6603a---30057022591.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c026b3085---2767182295.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccef95d537---betefiroriz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cdcf922da---74864061375.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/75665883615.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a260941d5c18c07723f5f3f2300c5992/6068509249.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/77088558549.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de09af78f---24043472162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=definition+of+architectural+formPDF 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_off00022b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B65 18020 bytes
SHA-256: 73af40bc198e96d7ea33746b0d50721ddff90c73c20a2bc6d2683fed6c6f572e
font_01_sfnt_off00025974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002718b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2718B 10536 bytes
SHA-256: 641a3dd45021831d2bcbd761e7450626aca4dacd35bcefc81d2aa4882125a8a0
font_03_sfnt_off0002894c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2894C 2448 bytes
SHA-256: f059538f04b9b2db37d18ec5e22335d4d682ee47268b1ddfc67955f72be9c697

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