Malicious PDF — malware analysis report

Static analysis result for SHA-256 3903267fcb763903…

MALICIOUS

PDF

103.5 KB Created: 2021-06-26 05:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 375605626cbbbc0b0c4e62b69e442b27 SHA-1: 1ba87077b42653a250570d7c00b90f105c881e2f SHA-256: 3903267fcb7639039fef689ba025b6fa5acb4aa2945c48d43bf3a61a288bb6af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document leverages a link farm hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content. The presence of external URI heuristics and the 'Fake invoice / payment lure' firing further support a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885d5bed321---dawirevuguvovumeje.pdf In PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/80307807616.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1817c9b5d---zolagobet.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/54138132531.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/4opmjof199m8vhsqsaunubq3k2/fosikonewebutunejekik.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5b8b4311ba3e7cfb92905f25772979fd/xevojawozekizonopodevoba.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/29f336eb80e8900f76cd64ca75aec5c2/84039737181.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2urijijf42sijl8ndva7k2vh8k/48874574675.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819fb269eb9---33318135455.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/pikelamapalaguvi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607790e0bf0e3---6395380360.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/dixurupazuvabozuvowupok.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dcc5f1abf---93877684286.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/p3gah2o7jdlkub37t3oifupoa6/72433150806.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094fa6202d3a---dixowiwanojumamixigun.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a951450ad13---giwenirawaniredokase.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d48f147b6---fugutulobubigebimolisat.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9b9f5349243f533b59fdea1bbe5a845c/19710830177.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f3b97da4d8cb96a36bb142010f7afa2b/19185950935.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/fudolesip.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/47170939481.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be69e02cd52---sozova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=insufficient+liquidity+for+this+trade+pancakeswapPDF 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_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 11208 bytes
SHA-256: 9371de3e945262c957ed1de936a741f49f6b7a803668e24aea0f3ba4468a903d
font_01_sfnt_off0001433b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433B 20068 bytes
SHA-256: 15a7c79234fe2b0b111ddeb1af1f6718994a015ea5a332949a78b97434c784e8
font_02_sfnt_off0001769d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1