Malicious PDF — malware analysis report

Static analysis result for SHA-256 6655b3b7f832c001…

MALICIOUS

PDF

90.7 KB Created: 2021-08-13 14:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01828500195ccca60c653739e45ebdfb SHA-1: 9ca2f1b8caae4736557c26ea39abefec68b89cbe SHA-256: 6655b3b7f832c001f569b8ce330910cf5f789f64ee3a7b592055a8ef97e3ca3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a link farm and the ClamAV detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://chcial.ru/uplcv?utm_term=magic+piano+by+smule+apk PDF link annotation
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071f69e3a865---61170432020.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab404251b---57388323057.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/91955484188.pdfIn PDF document text
    • http://biosite.ru/images/news/file/wixufisoxuvugeniza.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/gitibibotixugisepaxav.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/25743782160.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4vq2qojqc79r5jlauen01o8qd/rufekezuf.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/2668996164cc34fc2e77cbf72e9a05c0/68404822312.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/so9b6lbke6tjoqvdm7ijfg6dt7/buxisigesasut.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160900a4b0ade5---347567383.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/wesorut.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6851c934---62006083637.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/66930203673.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e81b168d8---kogutefijixixele.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/be35512b31eb804c67d23f3ebbfa7187/77671778080.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j4d2l26bcjkfvrprq51i8v5r03/bilamabap.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8662e05386df6072a8b2cb38610fd1de/17732385673.pdfIn PDF document text
    • http://bronia.org/userfiles/file/32177795207.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db44405c95---busug.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f86a3efb6---34275321491.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/80433379934.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/30174430005.pdfIn PDF document text
    • 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_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 17152 bytes
SHA-256: 2ede4c6bc0995bb5e059055c1d62d015ad11fc85e5416bdf58f9c15428978dd0
font_02_sfnt_off0001440c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440C 10960 bytes
SHA-256: e5a10059919eacc61efa97f21814555484b694e0be824ddf8b180860aa926a80

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