Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a27cf86b8a3ff5…

MALICIOUS

PDF

93.5 KB Created: 2021-07-15 12:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8ab33b7ba1d5960cc7e03e3d960b6e8e SHA-1: 14eeec9168756029f2534b0e293144a188602f66 SHA-256: 39a27cf86b8a3ff51d47fa287f096967a87c76c75f9f89dc607646e37999ee24
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The embedded URLs are designed to appear as legitimate content but lead to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/16aj8cgejp5b9unuqbrru47r0p/76338874159.pdf In PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/pma4tfv5mrpics37b7mq89dv3u/66235551226.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16089697d03aed---40471283071.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/891fgic3no93665c439e5p2r0o/42986737883.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/106a8a10df2c27fa8b873382b530c662/temitarotuvipewubetinizu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1h98uat41l9iqu3b1hl833bj66/nezowofefurex.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jufobujifuverapimeduvejan.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/dutanubafeloxari.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nodozu.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/xuvirojegofuva.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/6ak6nkep2pmrt2fls2mq1m5ens/20023088747.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/zodimaxota.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c73a5bb8f619cb23821a4c046f4c05fb/nozukivakuwidivebubave.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160973c00aea81---lanevejawe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c0f719194---33531794458.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/13087598114.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8faf617e9f401fe33fc19280de1039fc/pigomi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a86e3036412313812f2bcc74c42de68c/gizifisur.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085dda6ef87e---14789297373.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg67pet72d2q9gmfouiusub3nj/13643660047.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/59744473934.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160babe544efb1---87541083253.pdfIn PDF document text
    • http://candientuvibra.com/images/file/18808160571.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d88cd16168---57794075410.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/naser.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/jonenake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=finding+the+limit+from+a+graphPDF 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_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 16988 bytes
SHA-256: abb582dc0dd245653a2e4e524e74fd781b5935f29fa22694db3d3615aff7003b
font_01_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED5 10752 bytes
SHA-256: 028d2cdacb62a57469e136af2e154912b5faca26a809f4952e72e0c60f00064f