Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa4875289ee74fd…

MALICIOUS

PDF

92.7 KB Created: 2021-06-25 18:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 017981b85624915ae3130e3a1c334ca9 SHA-1: 541d0bcece5fca8f43275a422a4701fcfee4e412 SHA-256: efa4875289ee74fdd2779210d99827fac7125420b12623fc0acb9a8074a9211e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous URLs, many hosted on disposable or compromised domains, strongly suggests an intent to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://saokienviet.com/uploads/image/files/bikalifugitowuketanav.pdf In PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/zajeguje.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5c41ddb5ac8eac4d95a05de284d5e87c/30972542533.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d44160457c8a4cdf6ab3cfc9e79c5c09/63253209909.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/l8h59f7gpm7napmgj9k1na3qai/20818407346.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/41616559500.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/kigifuzaxulewibogijiguluz.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609156978441b---85984769852.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/vabupaxe.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00be4e3d5f---naxudunorofevaxominasonun.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e37b4918---rulat.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/dirojusobugotina.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/wevetodejitibukotubogewi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e54a51f7c---4631869057.pdfIn PDF document text
    • https://papiratisk.cz/soubory/kovovapoxedut.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16095abb45a6f8---41993271871.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/63121140784.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e3669feedd6886af520d4cbdd070a3e9/kurelesozenozat.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/234h86q4652dolcftanbdme7tq/jadodosopobut.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/55799505529.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/07fnts7dfkh3e2o4re2vnelng5/banikegida.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a90bd8cb84c85cbb46141c4ee1af0673/50030387221.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kunukuzititugav.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/34bff80dd7aec090e07b590ee99d8281/31704502782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=man+of+steel+full+movie+download+in+englishPDF 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_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 10944 bytes
SHA-256: a994420237bddf654a193ecba6c15a903bf5798ecf90fe3d3e0e367df582a7d7
font_01_sfnt_off00011f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5E 17608 bytes
SHA-256: 2f848db5c80b03641c01cafd1a3cbb31d0aa25a91af80fc3548d72cd8f61df2d
font_02_sfnt_off00014d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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