Malicious PDF — malware analysis report

Static analysis result for SHA-256 533e5c135ad4ce07…

MALICIOUS

PDF

78.7 KB Created: 2021-07-19 02:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7811fcd58f980519f2a6d2643418fec SHA-1: c6ff4d945add29bb2b4a2ff19d0b7348378da099 SHA-256: 533e5c135ad4ce0740ace520c3026c10fafd31c7507642a3f751a1301c9498a4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://loaamtran.vn/files/usersfiles/files/16771827189.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc3c871c6---78989256696.pdf
    • http://jagodkaprzedszkole.pl/userfiles/file/54047677984.pdf
    • https://alshamiltrading.com/alshamilfiles/file/nujeguf.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0b321d142---bulexapemiden.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/hj8fe0mags66ubul1nv47i9hm2/mipuvelefamuxopiwofevasal.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/37632444019.pdf
    • http://www.aportecnica.com/imagenes/editor/file/sonaxizurimubuwabezaralas.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160892286e89e4---dabekomozib.pdf
    • http://1yunnan.com/ckfinder/userfiles/files/24642418999.pdf
    • http://fastgood4cheap.com/clients/4890/File/gapudovulozuxonug.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ae58d18f7b578b481c192c958f4c63b0/4392098794.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/b7mal3gf4ak1v98l7ol8ofisp4/gosarigagawonuniti.pdf
    • http://accessiblevehicleservices.com/userfiles/file/69396091490.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc29db3cad5---ravipa.pdf
    • https://parklanehotel.asia/userfiles/file/62010340699.pdf
    • https://transport-vehicules.fr/userfiles/file/31008927686.pdf
    • http://dui-antidote.com/images/userfiles/file/53535145932.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ecd86be9---42144812151.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076c1549a60d---lapizuwiz.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fbea1c116---15268376720.pdf
    • https://tangentemag.com/img/file/niluti.pdf
    • https://kueapem.com/contents//files/66718489864.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/19lpgf7oncb1d4k1cn8njpphbv/fidavaxifobuzozezulozafab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+king+of+queens+season+5+episode+23
    • 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_off0000c7a5.bin
7c24c3e922612654d7477fbde60f7816a64ca9143a6daadfc3dc49b9c0f4da00
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A5 11260 bytes
font_01_sfnt_off0000e18e.bin
f4198af2109f6986c195af017848aae629a8af13b04c662980b1081a3f04299c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 20740 bytes
font_02_sfnt_off0001152d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 16792 bytes