Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bd718c00d2d4ab…

MALICIOUS

PDF

102.4 KB Created: 2021-09-01 21:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e4fcaea76a8c81a880bc8a0709be554 SHA-1: 3981445fe0eca065b6ad16d6722f51a895a67399 SHA-256: 73bd718c00d2d4abd3c04681db6bcef2b9b4c9b2c5810b94f9a6636047783a7f
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6da2397ccf---75491224932.pdf In PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608910b277d93---tunobajebad.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/717770d378d1b218c55dd6be6e960ceb/dikupobilutowutamori.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zetuluredizupebetejawi.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/woxowexaxosefirikumopowuf.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/krpbqm8lq4v4sfkqjfaehqre6n/26949765765.pdfIn PDF document text
    • http://jarosi.hu/files/file/nodejudimuf.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b18409b10cb---feramowadarikozavonifa.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uuph0d882fgm40lncm1d1lekms/doteluxifamazojafu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab48523176---388949367.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zurikezotor.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/c814bc6b0e10c282835e2980ecebfd1a/63559105927.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb32a63015c---53738995879.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/25720971278.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114caf2ea163---nunofexipemasivosufobat.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/62393694891.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/kiwutuzepisazefuxi.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/1272464184.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcfc2e8434---40166603055.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/niworivureputufewibeka.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/61400542830.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609489c86dcc9---dotuzobovof.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/24627499120.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14dd0893b---43229673796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=one+night+ultimate+werewolf+charactersPDF 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_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 10992 bytes
SHA-256: 948198ac2e46c3468d6f945ee8f561f0ef1ab2fb2fde6e6f4495f7623b68fc13
font_01_sfnt_off0001439f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439F 18164 bytes
SHA-256: 04aa52d891e305fb78a620d13e9751320545f9368f4fc5284d6ff2bb3edf3819
font_02_sfnt_off000172d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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