Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a3bae068f67b1d…

MALICIOUS

PDF

105.5 KB Created: 2021-06-28 08:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fcf5c241c17b2011293b902119a9b86f SHA-1: f02f84aca177a0f944d8b7158a7bf4a64e2be493 SHA-256: d6a3bae068f67b1d3fddd71454c8f32d22a363bf6db7a7d446328a095674bbde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a tactic to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host or link to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://coretry.ru/uplcv?utm_term=project+on+recruitment+and+selection+process+pdf PDF link annotation
    • http://zdrowejaja.com/Upload/file/4286355300.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e7f957706163dbb1c9085cb2858567b5/18363565021.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160843f773cc1b---bomuwivalizuvikarovuf.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a383f3d01d0de4c0aaef60a9864488af/33905421157.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/54241467408.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/kukesotidejezeb.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f39c0d5ed593e942e295afc88d1e5a67/98009189810.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcdbf757da---dekebezaro.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/jeruxejudapivoderidi.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/ranuwokukiwijeri.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f362cdcd55f9971554d5327279f78743/66091115901.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/sajugijitugutawir.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f3d705c1ed52e05bdb95b211f79ab67c/wisufijidubew.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/c3jldf5h1r3pu0qi82gio2js81/44387272850.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1b9b81be9aec5462be168a926600158/73399572648.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e0881fed---62728267310.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6ba0fe92e224a63ba5c7bf9a88791a81/33271325005.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bixamizelumataziwa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/782b6478e28f10bd00d32aee790372d8/fogoruzepupuwutudotafuw.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/lokolu.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/77291108620.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e3429d970---72371414398.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/15f315504a25d0fecc571c00ad74b694/zozugi.pdfIn 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://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_off00013976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 11012 bytes
SHA-256: 57eda5375cd130a3e881c2b2e44b21816ed58ac646aecdce65a3be70d5e532f1
font_01_sfnt_off00015301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15301 17372 bytes
SHA-256: b67fb72fa1ca5c4a6221331431d3a1d5f71f33a813cd84f5080c12280fd3e179
font_02_sfnt_off0001808e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1808E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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