Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd377c19f0cde90…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 12:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3259920a24bf4b2bfc2670f67810a7af SHA-1: 658f0c4fd0beef5d224f5afb642d6939284fbac6 SHA-256: 2dd377c19f0cde90ce5e29655fdca56a0321f056829b1398af542bee7ac64ca4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised websites, suggesting an effort to manipulate search engine results or distribute further malicious content. The presence of multiple compromised CMS upload links reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://paperland.bg/uploads/file/jufugewola.pdf In PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/rulazefadowigazad.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160736bd22fa53---98475096269.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d10f1e66---valoten.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ef1320sphcagm78vn2p77i0bgc/bomafixalasojigolego.pdfIn PDF document text
    • http://asfalon.com/__files/file/visefibatejozuvasananu.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/39571474382.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e870eafcbc---kunofi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b79b624801a8468a0dc0a8040b837435/89119239906.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6375cd5be41a6525c599a2965a5934aa/siximaleligejavonil.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/zenikowevituxux.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c18c8b5fb48---80355235102.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/mepafaxatiwadimelevazitop.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5f8c398b---sesalekalemetudilezomaja.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5d3668f749ed5800ddcb5811b06db051/12341913923.pdfIn PDF document text
    • http://akademibt.com/resimler/files/mumijigotazu.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/67642797089.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/88137164735.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/1138ef97a9736892ec097138e645dcc0/wanibovevajakuxorifota.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/dugepotibinutefiwe.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/nevaz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092825b199eb---funipuzuzosugagut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=preescolar+en+mexico+pdfPDF 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_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 18048 bytes
SHA-256: a75d0ae9d94acf9f9ffcd83726fd0b93d66b2ef74f2c82f77b2450f3bb78ea15
font_01_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 10784 bytes
SHA-256: ce98de621286f26d820b8048eb07b785d02a805219ea5481b1c23f77ccfc63d7

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