Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aae5065f3bddd00…

MALICIOUS

PDF

101.5 KB Created: 2021-08-03 00:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b16d2497187269c4a9d9fb4f1ed2356 SHA-1: 5c69601af17f39b01ac44847f71ddff3b0677e86 SHA-256: 8aae5065f3bddd0011cecee09e80e345525c9c88fcb1fe3d8e5f6b0933ba8e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/01e879f19f76879f4e2d4193383c6d56/nerozosidigizedamemozudux.pdf In PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/77402035596.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/5317bf78f7995e1cfda1888f4181b76c/bewipu.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/34448841390.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/ligazemadilimewolevufe.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/gunaruriroz.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/kifolaxa.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/jutabuzuvawodel.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607599d953d8a---fegosawijirosafuxirem.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/salemuduvewavovadajokizob.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/38086765200.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/74352605108.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/tisexapafisubev.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/lvoe1peepd17a8iv6ud2qolc43/fitifupunilasolojasaxozo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8bdb26889f---61802330536.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b26d269ece---27091206116.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/lelutilotivejav.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093a95f4a0b8---doziliwumewodigulajoxap.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49dc5ebae---wedefubuxokidejamotaboma.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e98ee4a5f---96713831876.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/4950547159.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/nufatijarez.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f52c8fe125c3c46fe62eb5a53b4bde53/wokuwewoposomelogoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=data+structures+and+algorithms+in+java+6th+edition+international+student+versionPDF 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_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 11280 bytes
SHA-256: ed3488a571aa6cf9ab29ca22e1dbdb175dcabb756909f3bc5de78d6bd4d5adbd
font_01_sfnt_off000141a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A4 17632 bytes
SHA-256: f8bcffab606ade7a5a277fdfee22c19746dd48ee7b7135439e4b0c210fe5abad
font_02_sfnt_off00016f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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