Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5f8efb7517e20d…

MALICIOUS

PDF

77.8 KB Created: 2021-08-05 13:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca4e4737d65788ec5ae8372a0d9b3377 SHA-1: e64d922aabcda21905f9d5bfe7c176342399d99f SHA-256: 6c5f8efb7517e20df53c656ade6e161b4b602694a6447bbc21dfe4621fcaf551
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe069ebb31---jaluradifize.pdf In PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/28cc1vpafdfau1ufdg34j31glo/37497905871.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/xebiv.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/70658018786.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab598286241---laferesavimiduvasuvojop.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/85031100921.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/0755a91c36bbed5eaed445dd4f1c846c/35570919312.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/03db8fc30e9508928d2d1af892f1f648/70097596623.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/d5796fb7bf01992bc0b06dc7656eb057/66023355885.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/1rg8vrietgbcgkuc2lm1n2eth3/jifazavatol.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/zifutizojur.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dibupevepunirarabo.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/44027193109.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085cbd5563d0---81634721814.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7389f78b---mosuwavaz.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/7b9a1215640a60fb8abd9f3113df1ee9/vejaxorep.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/65dc2c9cdd0afade4e4c658a50b16c83/gimogoxeromutufavuso.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/88221454060f7becabf3f4.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/95781298623.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/33749801214.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/buditinimexiwanabonedixeb.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/15e6f9bdc7fbc90a003ae6576fb7547b/29823392180.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/jomer.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/rvjrecqnuh65df7d4i4o3kmuc3/wofixeviliponixaxaluwi.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/50384418174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=samsung+2009+wireless+lan+adapter+wis09abgn+driver+downloadPDF 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_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 11612 bytes
SHA-256: b5c11fc4a6a3899807bf8aad23868fa6f8b25d19e95ffe58098285777ca2856d
font_01_sfnt_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 18544 bytes
SHA-256: d2a0f5b546c484cc12b69932d6070133a373d5a3275356438507a027e46b1205
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1