Malicious PDF — malware analysis report

Static analysis result for SHA-256 067b2becde5df80f…

MALICIOUS

PDF

193.7 KB Created: 2021-06-09 16:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6a7bc946778070a236e28ce99302872c SHA-1: 5e3ea51884a608cbda7bcfd66acd54f8ac979ce7 SHA-256: 067b2becde5df80ff49382240bff6e97ec3d2a9e4b37a3ff485ed82fb7607d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a phishing attack disguised as a free book download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philabc.ru/uplcv?utm_term=structural+geology+book+pdf+free+download PDF link annotation
    • https://autosaloncenter.com/uploads/file/gidajeguwelomidufetizom.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b272d09a16---kutosewateweluni.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c57677fdb2---pamevukijo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af6052042e3---70893768706.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075880ba07e2---dofozesejirinusakama.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af199e80d00---70648175481.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608550a52ea1f---rilumetotud.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9ef9c8ea2011cf0a765fa775d61d6a6b/62904622448.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/86662232425.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609224835a28b---28729326101.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607095c4c911c---gaxusamil.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8fcee229---wividakudefidag.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/da1877deae482bbeee02efa5f7122e52/ruvixomuluzovubowevox.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d3e414bbc1c183d37dc6731e8537dc3b/79090222565.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2a24b788---33797198628.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608222010ac90---20534331982.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00028710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28710 4532 bytes
SHA-256: dd34e40278a5a3d1901c4b0f0577142150b990b15ffa4cda3f1697c7cdbb242c
font_01_sfnt_off000296b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x296B9 5648 bytes
SHA-256: 3aaa3899db7f652688aaf82758dab4f975d183ed07edccdd52a9812063d7fd6d
font_02_sfnt_off0002aa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA19 18720 bytes
SHA-256: 95b020c90f7590dc3d3b322ee809e3baa6659ceae23549438de04ed38dc66e62
font_03_sfnt_off0002e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E1E0 16420 bytes
SHA-256: 15cbd5e4fff83e4bd1cdfaf67231783c046e7e6e66dfbfcdd267e051fd77cc32

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