Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bec1d8030d237a…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 19:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7ca06b1112b00ba6589331922ddc8fb SHA-1: e4af9764fb2195d7f9e4d6c1fcd16c656acfdebb SHA-256: 36bec1d8030d237af5080d1b2888a3c47125d59cbc4decf7c72e161cb5cf16c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, directing users to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://equantumconsulting.com/files/files/xezekimumo.pdf In PDF document text
    • http://lideparts.com/userfiles/file/1626097011.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/4783194026.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d8efe27319d---tipituzatunovivikanapurup.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b2abdd1d---gezabonukajivosiso.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/rimopaleteti.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609617201fb5a---97070240547.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/webolakimafetatatoxuxizo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87718728967.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/38097033580.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/leramelusan.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/xikegolovosugo.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/pugabisuvof.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/jizuwazikasifokarurobo.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/veveza.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/dojizis.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/38031653770.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/7mumf19ii9f0rr5jktnp03f9lu/retozoratexiduru.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/61163708239.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/tuvazomawajovid.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210628_195325.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc05c4e945---fevewulubowanasobemoz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/25717851205.pdfIn PDF document text
    • http://teraval.cz/res/file/bowow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fellowes+pulsar+300+comb+binding+machine+manualPDF 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_off0000bf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF34 11460 bytes
SHA-256: 5e00872cde7cc4f7c4830c9097b8fe052fe975cde7e8ddb3e04e11cf9bb7d3c3
font_01_sfnt_off0000d9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AE 16908 bytes
SHA-256: fe3fd51ceb29040e4e2cbb46edb0aa86017c23eaa80f3948827c6a970ab65b44
font_02_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1