Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b980980fcc6d31…

MALICIOUS

PDF

93.1 KB Created: 2021-06-30 15:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7c16ff8aa0b0b256b511e74cc39720b SHA-1: 2b544505b48d757e55d1749984082f098c5e3585 SHA-256: 37b980980fcc6d312a84adadf33edfd9ec2044510d7f038915a59127ebb936a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or SEO poisoning tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160794286c78c2---72330431915.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fc8e2e83ef0d3236e692b91198ca7f0/kuzalugoroguxab.pdf
    • https://living-stone.lu/userfiles/files/22966902344.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bfc3edd1---9629365502.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9gcvb0r3jht5i91614e82fl2js/korinixilopilugawipek.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/90aa3a428210cba0204cab577981fd6a/vawixatusudojalak.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b599db807322c6d92e8d79a502510aa1/70959820323.pdf
    • http://bigband-ulm.de/userfiles/files/nominenetojo.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ed2n46jbqr8a8jg361kdmtiac3/zizeduwikirejuburo.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bc34740e---77733904491.pdf
    • http://abbwingslynnhaven.com/uploads/files/84792563240.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/aa945418bb2c9565c426f5d6da9b7814/97980988242.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c1603ae817dbc3e9d3a3edb769c5a914/pukowesamujuve.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff6af247f6---85204639884.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce26145015---tibabomiv.pdf
    • http://com123.vn/uploads/file/wuvebaxupuxolesozemorepa.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5273da90f---20986056590.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bbde3d588c5bd6827ddf50685162f807/31165534002.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a38a8f43262---32128459031.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e809e5705---mozijogaxiropiwapopem.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd845296e5f---nupamivemiwojegow.pdf
    • http://promador.pl/userfiles/file/mategaroritemumawizumosaw.pdf
    • http://studiosimonepantaleo.it/userfiles/files/63560403048.pdf
    • https://doktor-ara.com/userfiles/files/keranabelawibuzatona.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=4+types+of+intellectual+property+rights
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010882.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 16792 bytes
font_01_sfnt_off00012094.bin
3dd3a09d090f13d95bdaf9e14e449a93bcd8fc0245bc0c2ddff4d5be58f8470c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12094 17260 bytes
font_02_sfnt_off00014d91.bin
450c02fc01f00ddba4948819fc96ae4f0a31863ce9c531d0b4729a51047b7df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D91 10952 bytes

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