Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c0437d85f88d23…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 20:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 778218f35ca860591fb1cb0967aa4c5e SHA-1: 6319f5dca23f6abb985ee6e899af628046e86d97 SHA-256: 77c0437d85f88d23200e6587ee273afdd2b3866d6105494c7ad69e8280c5b4d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. The heuristics reveal a link farm structure pointing to numerous compromised WordPress sites and disposable hosting, all serving PDF files. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=can+windows+10+convert+pdf+to+word', are designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=can+windows+10+convert+pdf+to+word PDF link annotation
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vfobk9h2l0lp3761s0169pnq6e/31337159443.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/pimuxixe.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/60585890393.pdfIn PDF document text
    • http://immopolignano.lu/images/28015470466.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/49087946757.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/fdb2973fda75aa6ed428653f092af58d/vokaxuribemule.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aa6ec80ef---gisedazotew.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/gular.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/15425623670.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/rosalamurupepezat.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/kixadogidoragolasufoxi.pdfIn PDF document text
    • https://tmtteks.com/files/zibelafegenom.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0nm7fdbj3vfbn68jl6p9d9ue06/95695441865.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/riwedodu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cd813129a9e5ce385e7acd7f6d8b481e/46409203632.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/letowep.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/tusiwopomavaz.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/7lrsgugj1a40hgmbbpa3fdtjbv/14567163003.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/75ccfff4443429c81bae190bae5d1550/88929894917.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/42307038617.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/90347143865.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/89111018144.pdfIn PDF document text
    • https://stopserv.ru/files/file/tuxomovade.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_off0000bb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1C 16584 bytes
SHA-256: b531e6c820692e58ff55c76a18e7b7f41f4d1cbd920b16575e37badb84e916d6
font_01_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 10924 bytes
SHA-256: dc515ba948187c9747f558f2c6265195aff9f679d159376c159ba81112e9b9c8
font_02_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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