Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45582912e10fc59…

MALICIOUS

PDF

76.4 KB Created: 2021-07-22 23:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cafa3352520563ef612cede8434c5b60 SHA-1: b7b701be41af7de6fba8b94bcacc2572f9f12aae SHA-256: c45582912e10fc5932328df69b2dc3bf7b64ade0962fa318576945132b92e038
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://bookblog.kr/data/file//files/jilafevepiw.pdf In PDF document text
    • http://senn60reunion.com/clients/876260/File/lujoruna.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1cc9d3a1febadb2c38a8abcef986ca5c/9645488600.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/45359940260.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/71944577790.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/kefafozukut.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/furinisatosijij.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9eed83655ef6c05b9803a249c2b35704/57944651682.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/44927605936.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/nufuginelaz.pdfIn PDF document text
    • https://fallsplat.se/file/86614833417.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/89100056064.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf695d840---gupokobirijumozagovin.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/bawepasizudidezuwe.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608024ddd0f9a---58151745635.pdfIn PDF document text
    • http://wenxuezj.com/images/File/17038504235.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e68d91e8a---22123234479.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/14533648871.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f0d77f567---89514679346.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fbf2ff1472d5fdce50f5cc242703e83a/dezurifuvivudejexa.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kogarizajobi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8c3e8086792fa100dd91bf9d9da574c7/lezubetujefamowisar.pdfIn PDF document text
    • http://farashimirooz.com/files/musofitezexilusijezezo.pdfIn PDF document text
    • http://cy2hand.com/userfiles/vodajiruxupep.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9cd11dc3461336201d75ecf33b5aa374/67925953663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+game+neon+shadowPDF 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_off0000c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC934 16288 bytes
SHA-256: b8e7b5e809daabba5951ba8f4ed98141154bdc6708fec55c829764f062673bee
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 10492 bytes
SHA-256: 38d9ac534b9e96d5e74660c4e25252d8e85e7812598bb9a06981d436a3ba85c0
font_02_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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