Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d69554823e5f40…

MALICIOUS

PDF

93.8 KB Created: 2021-06-28 07:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6dba972ec0184bf501e43d652dc0621 SHA-1: 62d0cbc05c44006a669b4dcf3876d189b661499f SHA-256: c4d69554823e5f4088992a88e0456c51ad1fda51d13786e1098915d4551eee07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to websites hosted on compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests the PDF itself is the lure, directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e8a1df2c12ba6a9c01a5ca41f27fcec0/30998079240.pdf
    • http://brandiassociati.it/userfiles/file/ferinamumupobore.pdf
    • http://blackivy.pl/userfiles/file/48169495235.pdf
    • http://banphimchuot.com/userfiles/file/7772457649.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/0a6827d3db65491b792ee156e3a14ba8/komufogaji.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0feacef393---47937963982.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/sb6k8ulenp4bhhving92muutb1/xiketuzujas.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/cmh8aoi574h5rpi2srujl87oqp/jijovofubenipekudakarazu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5206e26693adbc16f9e4c4b1526d2b69/16817212237.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ea54a10f---31386259921.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/tolarobasijaboralefor.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b1967d66a---89007072491.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/majodatojak.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i3htja12g29gjso3tl66k7o6p7/87470789149.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827589531d1---wutuxagosofe.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd25949200---pavofirusurovotokegafite.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/67fcbe1033f95fbc5b63a4a8fb3d5dbb/gijorani.pdf
    • https://ewastexperts.com/userfiles/files/wuzikulexizipanimoligebij.pdf
    • http://przedszkolenisko.pl/userfiles/file/rekobumokusekikuzo.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8e9b7adde01d1fb33cbde65065b5f3af/ruwoxovigodejagusog.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5c1409d98254ea007aaa73d06d722ef6/22702609808.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0bb0102e---mirew.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29a132dfb---95376627938.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qr8vl5d719ab876qvkfnksi9a4/lanalu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=old+mill+corn+fritters
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90b.bin
b32d4a6518112fa5163b13656014c4ee40674eb6c54cf530a53a1159a99d8771		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 17916 bytes
font_01_sfnt_off00011766.bin
5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11766 16684 bytes
font_02_sfnt_off00012f03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 16792 bytes
font_03_sfnt_off0001471a.bin
358c330ded852633916b8821aadc7ce7f8b1d405a3a470145861e2e03261f855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1471A 10500 bytes
font_04_sfnt_off00015ee3.bin
065c7a4f11f9e75f6e8b37807bc82b370f7b2846456f0b3b832c619392bb01b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE3 1824 bytes

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