Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d93af890e401b52…

MALICIOUS

PDF

86.8 KB Created: 2021-07-23 08:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c4f6c291af20249914d1572df2380404 SHA-1: 631642f85bfdd1c50aa747c041f4f4178e4d75a2 SHA-256: 6d93af890e401b5252c76b7d9fc69a145eeaa522582bb3eb5568e456bc494f57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to external content. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classification strongly supports its malicious nature. The presence of embedded URLs and the structure suggest it's part of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/87ae7d7138024d6ee07e8568a9d6b8f9/6642319840.pdf In PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wudag.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/67k7c60i5d2hbeielh7i322fj4/59987301751.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/14835393601.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4454d0783949d7771b769340ab45798d/zatobibexa.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e881e8f8a8---57138457807.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb55412f106---84338988890.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/wilitafexufaxotulokili.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/e9bcda5ab98cd50e44e9da9e90065d8f/73183566037.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/palukekuzofujevexudekogax.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/eq3ova96eikm90fejaakhefv1q/miwovazaxawevaruwuwibi.pdfIn PDF document text
    • http://isvpro.com/custom/files/44174350820.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4777b686---pigolikuma.pdfIn PDF document text
    • https://ultralloy.net/upload/files/ganetu.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/91469352917.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/93231295605.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/67794909614.pdfIn PDF document text
    • http://technocom.pl/editor/file/66726752716.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b141f79b430---fumodovijuguxoxobo.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/64553389087.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e9755d2b78c---44173206379.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/92247576324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=services+marketing+zeithaml+6th+edition+pdfPDF 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_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 17516 bytes
SHA-256: 1d13092540998e4e2eb12a5168e49874ffd2afdad69e20eac49bd900e24fda34
font_02_sfnt_off0001316b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1316B 11528 bytes
SHA-256: 47e76e9cd03d7ca12ed798dcc2c4de0041e0b615482f408f5cd8e3b13f2d1666

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