Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76c8d654b33fb87…

MALICIOUS

PDF

76.8 KB Created: 2021-08-28 05:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0986aafff890ff84c5e695ac6fffc81f SHA-1: d16e82e3059dfe4282b5d16fc2e9fc643c18be52 SHA-256: d76c8d654b33fb8771e9200425d1c00c4930dea04bb0ecd3235015d273c9e6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://igs.compcierge-asia.com/ckfinder/userfiles/files/mitegotuwiba.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ccb46a750ee579c319e213df41455b84/funumameluj.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/59304130159.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f1edee3ba04c13939e37aa8adb076fbd/15893268396.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e8dc2df019d259c9dffabf516d484c0c/45499031993.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/asmmo0v5ell06j601dvn9of8mb/61427952726.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160835c625d402---xonov.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/53665951660.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c540f9b09032c323fb967fdbf7be4a65/bemojaba.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/94624856125.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210806122949_3yk5fk.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/18319541344.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd4240f1ec---87562257288.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf117c452f---610910950.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/fesuzuda.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3c308e02---bedutuwevubiru.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/lebirozuli.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3baf808ad42ab2ac6d25b5d20a3b00fd/komoruxituzeleratevakogu.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/18332809282.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kt68uns3c0ib0e6sd669p111n5/19160000555.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/80046530103.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/23400141693.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/tudasonototonu.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/38195182166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hoof+and+trotterPDF 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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 10032 bytes
SHA-256: f61ec0688da3401dc4c26090a1815af8e083103e7fcebbbc5d5b6f34cf345a1f
font_01_sfnt_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 16816 bytes
SHA-256: 62dc0837e9ecdb923c1aea518948b1ef9504e81150275fab0d197765eeb97a95
font_02_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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