Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc57bc7d40633f9d…

MALICIOUS

PDF

81.5 KB Created: 2021-08-27 08:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c2ff29de2b4e044910b6fea8fcb8b91 SHA-1: fa6d9d5238619705ef3a20eaa54b47cd8e2b4947 SHA-256: bc57bc7d40633f9d7f82196389434ecd3455f13d2f252a14ca12ac85efaf1e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to manipulate search engine rankings or distribute further malware. The presence of these links suggests an attempt to lure users to malicious content, aligning with a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d063382496a3921b1c13b690b58eda98/botupavosobarafolikemefam.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/bepijupevokazoragavu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/39a85cd3182b0454c9b069e28c08e61c/78139736045.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f84ddbec6f09bfc11284d177e7b1ba9f/67574603378.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d71b097ed0f607ccaf6fd89c8a05a72d/zowovituvojisofawivoxi.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/muwabajejupalose.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd57a4d4f6e---39890252253.pdfIn PDF document text
    • https://ebooksweb.net/files/file/67222774513.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/xevaripiwe.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/kemimonu.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vutimowugoxujukane.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/cb92ffdc96fc2a0763cb733226875869/lewenoxizuragara.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/74323028274.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160930bab66fe2---zozijotubuju.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/muviti.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe7bf1df9---xuveludefala.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03a82ccb4---muxum.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///66326819779.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/14254848186.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/74511187924.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/67363002467.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kuloxilekosexalamuvuv.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/i9gvt6ggnvss6ulid1c432ot69/19188387906.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a08090858a686f1586ccc9785440f5c0/magavelupogejipuximi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/83e42c0b23891bfd870277266c33e2ca/58495515284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=arthur+lewis+theory+of+economic+growthPDF 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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 16104 bytes
SHA-256: 013f80322e5ef7789ff6d2d7cb4319cfd474efda8c8b634d45110d3c0cdaab71
font_02_sfnt_off00011eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 10900 bytes
SHA-256: 48acb240f88199b6fbd6671bd6b69b0509246cf16aaed7863c4be3592bc4eab2

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