Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d967b1be910b8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 12:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94249a85b9a5f6383cd4ed3aa44015c9 SHA-1: 68342f934d32ede05d11d6955e589d9eed5b37bd SHA-256: 261d967b1be910b8c445b26218004a87d72269a01e018820e53a021c413e0d55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe481d62a1---31276910947.pdf In PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/9be315a61da09f921a291ca9dccbc39b/devipepogepegobidug.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/pogifejaronusuxe.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/46929586414.pdfIn PDF document text
    • https://pubgpin.com/calisma2/files/uploads/57259966692.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/23019281493.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03e733ef3---57575016727.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160875f90df75b---40538234219.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b39a0497---mizomenajapalemena.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/f1mn6iq4u3vmdacc7q3clihf7q/jogodolubepebotisoradel.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a3621ee58---lavoketuxorobi.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/tamoroxujimi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/61174198517.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a49a21b9bfc58090e227c3342f3cad0f/94144402735.pdfIn PDF document text
    • https://go2germany.ru/files/file/84423438361.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pafuzibidifunali.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/kirug.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xikizebupuwelideleriweb.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075df52d3db7---milirusumatupasote.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/lobin.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/72377507408.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3680a77c93---770223703.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/51107207392.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/68601ab2cabcd713707b7762bacd7308/29520706353.pdfIn PDF document text
    • https://retta-bg.com/userfiles/55100652919.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611d958264f66---vikeruwifuluxesiked.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=systems+elimination+method+worksheetPDF 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_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 16936 bytes
SHA-256: 15d7e0afdee4012a74c40ad88becb0b44814c6b796b968736d45ea8d6d735b65
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 10880 bytes
SHA-256: a6d848b146f2ff6d3fc6eca3b6ba6f98be9259039f4f392d161c459825082b63
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1