Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dfa30b4f0b80ab…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 11:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52986cf099ce13396dd5bf64c7fbc353 SHA-1: 734eabdc7a10ae54fb69401fb9e9078a1282f846 SHA-256: b6dfa30b4f0b80ab9c44a11471039c56d1dbd4ca6c19ba6b704b4b974b56c787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories and other domains, likely intended to lure users to malicious content. The PDF structure itself does not contain executable content, but rather serves as a deceptive gateway to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c65e08e6c01---48715485554.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/698b9fede5d9b2c640737ed864dd0b3e/perefafirizovifiwesomi.pdfIn PDF document text
    • https://badoza.net/userfiles/file/bexokelufomuzalal.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132b43749e---revojozubisus.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/78881263640.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/52437798990.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2fq9obaborc0vs05hrh7jgskj8/mobinulebalesamuw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c1d18a477---20571759739.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/samipigafadetoxomugaxa.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zoxevebivasero.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/gelaruwaje.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/25499526729.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/mamogofigilewujowukopodi.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/36732369678.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fb126f16---fimowevusenokijike.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160762d9fe0212---dazafimapas.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/dulurokinerovan.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/96137416838.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077700845fb0---1885278003.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a2b7f7b1b3b5cde7f87dfa418dd5b344/fipiroxuwunefare.pdfIn PDF document text
    • http://dnepropress.net/files/file/80280427635.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/mibavonodumimokas.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a675cd04c2e---87230108948.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/76244204034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bescherelle+anglais+pour+tous+pdf+gratuitPDF 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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 19212 bytes
SHA-256: 1cc5044bd7f3234e6a8b8388b54e9b677d27876692e3bfa4f8a704620fffc89d
font_01_sfnt_off000106be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 11052 bytes
SHA-256: 1286c8e344025464e78ff840542fe0c0772b03b70a1be587e861aae93c336132