Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a91f868e2f9f78…

MALICIOUS

PDF

92.7 KB Created: 2021-09-01 05:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a71dcac7811122532217e9fef787ba9c SHA-1: ac3a0ec194bc92d3d051e4cc7c23019094e82dc5 SHA-256: 01a91f868e2f9f788fcafe373f4d322d8280ac4084e2349a7964f2db2b690e82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=mis+in+marketing+research PDF link annotation
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1f46eb0456849c7db8868994bd1dcf3c/54569813067.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/getumejofemobowususoputob.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/35036021276.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/majate.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d2eb6870---sakisejuxikikum.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/63391588733.pdfIn PDF document text
    • https://go2germany.ru/files/file/99153943463.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3196ac56---90750258109.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/sazazevukezilapudeva.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/69584708839.pdfIn PDF document text
    • https://landi-bg.com/images/file/40636305517.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/28165852607.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/324de366e449327db2db4920fc2ec7f6/lifixifeb.pdfIn PDF document text
    • http://abnicum.ru/files/file/42465669455.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb1a3289c---50155622133.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/tamegumifizonosepomuxewe.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/t3srgt6cj6qnt4e55750nq58nd/41557416618.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/rufesunurufanadofodibe.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/85646810332.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/zovokisavudixav.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956f63f2c1---dunurufaroxonasonefobuwe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9d3e7dd7b8810b8990ff852492006929/50123797433.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/81179839787.pdfIn PDF document text
    • 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_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 17960 bytes
SHA-256: 44adf1e9b8070c102fd324bccff1e9dc05a4cbe6d756f603240b5f698bbec4e1
font_01_sfnt_off000134c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 10596 bytes
SHA-256: 00cc24f27a710ef0e7e81352961e4a4c4e832af9beb61d744fe658bf2ae404d5
font_02_sfnt_off00014cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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