Malicious PDF — malware analysis report

Static analysis result for SHA-256 d540ee1b6f0fad61…

MALICIOUS

PDF

99.1 KB Created: 2021-06-27 00:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1684d03b7b67ec0bbd56b2d5f5b4f707 SHA-1: e19c413a66066d313364bd56968dcccac8f14127 SHA-256: d540ee1b6f0fad6164ce68c4667e2a7a5a83082964a97222fbd6115045452b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the nature of the PDF and its link farm indicate it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://oniceh.ru/uplcv?utm_term=dark+souls+3+how+to+get+to+the+ringed+city
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/b3ab990bb829c38e4eff8f5874a5e010/sunawidatipozexikemutuki.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16099bca208613---43621210055.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba051e57f---zomizugetitoliwitonad.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607831ee9fa38---55207025603.pdf
    • http://habitat3.eu/userfiles/files/rafabuzu.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ap31uah2ldun0nqplmol64it5s/majobopaxagu.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f7dd9ceb89edd814a718fcec71ada097/64499656267.pdf
    • https://salvatoredivilio.it/userfiles/file/timetofumavukuxatuwu.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ec4b071fad06b27cccaf593d2aad576a/1992748290.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/be689dc3bf19ec950bd456b6a8041ba2/munakowisexafalokelevu.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/18iq8867bo7639qavkfvagrdur/84061825381.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/2f5ba0fc912aa53a8d39e68bdb21ef9d/11683589705.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff1b8475d---tinojiwu.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca12441be---40575591751.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943f2f3ddcc---lugipinodawukuwodibule.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/7nubj7ph3db7nqammmgq8qgbog/34031366134.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92dc278685---mowakoluviriwu.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/470eddfabce34c2f1c71eeabb5cec57a/81597310247.pdf
    • https://parklanehotel.asia/userfiles/file/32144075523.pdf
    • https://oumkua.com/userfiles/file/zufupazaxotololefipezan.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c7e881c905efb92a07e04183108e6c7a/nuwexifokuwigegowu.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799dfcbd38e---50016354995.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/4kdatn9c5nmkefcv91en64bi7n/21771731877.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001149a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 16792 bytes
font_01_sfnt_off00012ca7.bin
e9f52a09b92e0921fb86a62c5407065a0af710bc1494fe255e1fe348b6ba51a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 2212 bytes
font_02_sfnt_off0001369e.bin
4df0a13f8712cd1c611c37a7d211ae13a81a5d912962e59692d8dc6e7d78540f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 17444 bytes
font_03_sfnt_off00016433.bin
ec1a4188c3e3248df046e7503815efeaa9066e781cb4cc89dcf26a4c9d3fa03f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16433 11212 bytes

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