Malicious PDF — malware analysis report

Static analysis result for SHA-256 566e813fb4a7304b…

MALICIOUS

PDF

89.5 KB Created: 2021-07-08 03:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9741adab20f269c854960ab3463f39d6 SHA-1: eb551f2bab90406ef1bd30976f347d2fc6d32110 SHA-256: 566e813fb4a7304b39b55d4d6f94b166954268be413a42fbb53576bd33ba20d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rjj3rfrddrtcbgh6oe763vfg56/68646588136.pdf In PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdfaa2328b288ec05ca04f65f9253f2b/70630767614.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbf4496c1---5649740559.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e981bc2946---51087357028.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5qkmkmarnnte1dbhktpvc6ifjk/kazivopiximujidul.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/34245793504.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf30ef7ac08---fumisorikuruliwoseg.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cbcee4830---mokibogujovo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16071812c0f46a---44049102562.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/67367134134.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a1221361af4---wirapoxowadubixelatapi.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/69093078092.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/gowet.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/rhmqsm7mkkonc56s7n4lt1mlv2/89637900099.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/tajametujivuxuxitidanu.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/946b0ea5cfd239cd8916b7a588fa2d6d/zexoteg.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/pepavukawiwewenat.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/defudadililujes.pdfIn PDF document text
    • http://hakanemlak.net/yukleme_klasoru/userfiles/file/bonosisotezuxojazu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc22b5c21e2---lenuludulokezel.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b5a1533dc27241f8088731519c59c40f/29755764991.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9ac432374---ludawoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+formal+or+informal+letterPDF 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_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 10472 bytes
SHA-256: d1d6af3e3485019d8ece0d0ad4662f83887bc1a6c0365572f5098ffc8636dda2
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 16884 bytes
SHA-256: 8e849ff41505f13f01e9f4b72e6feadb97c38f3baa0a9a129c0c35eaac3ee7c2

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