Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb2ccbe7f23fc3c…

MALICIOUS

PDF

92.9 KB Created: 2021-07-25 01:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c33f6867931132c0202327c278230dea SHA-1: e725cab181a0417938e06cc04d4e2189439794cf SHA-256: 4bb2ccbe7f23fc3c83be8609d970c15557c86b7316a1df9555fce10c800d0168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host other PDF files. These linked PDFs likely serve as lures for phishing attacks or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ee879fc92bedf275032f5a7d81a2f768/riludo.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a227a786---49758703734.pdfIn PDF document text
    • https://scalper.ir/data/files/file/8644190843.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/3768fb020fe81eb805c32866384d02b9/fejatafogu.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/92858526944.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac22d95302c---komelavuzivimel.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/11755678679.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/nazivutawaxuwezugasu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mm53kv9o7h2s6jc4kts2jst0ie/17148940737.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/63c8ec95771f6baf6d9d3aab4de82c50/vemanotedef.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/3005510566.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1954f0a220a128cb70a330dbac5d5f8c/zobalupet.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/2puvqdme53qftg8f2crhfbnn3t/64138556426.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608616f560f6f---powakaxa.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/dumize.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f874255020---5124810874.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/42579194571.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/uphqbtlld2mjqel3j5l0mf6uig/begimuwaxamefaxifudipo.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/99866002345.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b621ff16807---57851806054.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/wopini.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094f067561fb---12957650011.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5f641594---20949370260.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/37923309433.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/60230583394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+operate+a+holmes+humidifierPDF 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_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 10836 bytes
SHA-256: 62975e546e19a5ecab63d65b56e48c1d9cdbae24f514191bc6cbffcc8dc1496d
font_01_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13966 17056 bytes
SHA-256: 3204a5f845179b9c2b9700f2dcba7131ca5f7289077871796b16877eafb0a333