Malicious PDF — malware analysis report

Static analysis result for SHA-256 0100c64909824421…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 01:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 392e0dc0edadce5511863986817f2860 SHA-1: 4efbc52397d5cbcc3018b552f19dd97c7ad59b8a SHA-256: 0100c64909824421c4abc14bf252c2f22a53e14c579e04d50474a31e545fac91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://prttour.ca/FileData/ckfinder/files/20210624_4B59D94878FB9C9C.pdf In PDF document text
    • http://slp70.com/clients/873855/File/97414633600.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/jezujaxanoxuzosuf.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/64760041eccd041eeb0478a2ecc3870f/66212858123.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/i7pp54ssu03ulcl8llknae9fml/33991355177.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ade0d0abe29---vepejejasavufozud.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/ribixigetinapodelevu.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/78218002376.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b36a7a12625---fivukuweberawovoru.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/050554024347.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210613_3F761830D2314FF9.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160855d0ba15c3---99345488998.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ef9d8c02---62194445185.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/repanujelar.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4a00264d58cee8613de32e1386053223/59401305164.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66134220b---41609309243.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/22203f3479774286abb571d1f402a69e/somelap.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/bidemupuxitapekepax.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb5eea564---rakadonulasuvimew.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e32c73755ae6650b60cee6a7afd22417/16514305932.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0950e7d046---lataxopasizi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0ac93979---17576749952.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac025898dd8---10740926976.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/bulogisekekiraguwuk.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/92222941009.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/94999908407.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/dexujox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=equacoes+logaritmicas+exercicios+resolvidosPDF 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_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 19700 bytes
SHA-256: 77dfba8592b8557483044f4559f482c31d9ee03e7e05f659fb94a855ab98493f
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 11004 bytes
SHA-256: 20ffc7a36e084fff1d2135711c48ef79398f9c24a02e5699e6366b7eebb86fce
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1