Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45040bd064a0570…

MALICIOUS

PDF

91.4 KB Created: 2021-06-27 09:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9624f613a746637e1579bdad2cc9696 SHA-1: 267ab1cca9e71cd576d0e2090ac5ebde8bb66134 SHA-256: a45040bd064a05702a22af989c8fdef6ef1ae6d524c354c7f06bf92d16ffab1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or distributing further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=best+places+to+live+for+single+retired+females+2019
    • http://beiks.info/public/file/kasim.pdf
    • https://xn--nmqu14inmf.com/upload/files/gabamateto.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d65b8fca---nokabap.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082084d22a3e---61461584368.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2090a322d3---bosaxisagexijinubasewuri.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a5ea000ff---64321076170.pdf
    • https://ahreco.com/uploads/news_file/nuponemokarimaxozis.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5033c903e---pamaxegukevidibaginuxige.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/62722767102.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8a7df08a6b3343585a9436734bb81a66/poxetapog.pdf
    • http://loscogliodifavignana.it/userfiles/files/bigufefexetuboregeja.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c6b6b615083a1db9a10554becc9b1145/27421413107.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/2861716648.pdf
    • http://huucodatlanh.com/userfiles/file/4631687705.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c6d3afae---manab.pdf
    • https://bistakalikotenetwork.com/userfiles/file/lapuxixagubimezal.pdf
    • http://dalboncostruzioni.it/userfiles/files/56641839233.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5e54f0d2956e80b7afa2b2f598150c12/20334131362.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/84020718872.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160babe2b1eee8---46806852502.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c51cd5b8911---43153411181.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/xofezupigu.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2269fec10e9c2fe450a38d43833f89c4/62276786407.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffea.bin
4749136fc2042073481a97f39078bed443269e401f28ceb1bd272b0eea987ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 17372 bytes
font_01_sfnt_off00012cc7.bin
370e37f3370d7ac16e00bfcf4c479feaea754483fe67995dc0f40f80b247acde
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC7 11544 bytes
font_02_sfnt_off00014813.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14813 16792 bytes