Malicious PDF — malware analysis report

Static analysis result for SHA-256 d905765407c97acf…

MALICIOUS

PDF

90.2 KB Created: 2021-09-06 17:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17e1964efa43dfe3c25b89463d99b229 SHA-1: 1ef4a9bdfc472af12523d72223b4ac143f0c7d31 SHA-256: d905765407c97acf9e1685b6c1964999b7cd4ebde785221617c381cbe3e65a41
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 as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a lure to direct users to phishing pages or to download further malicious content.

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://wastran.ru/uplcv?utm_term=autocad+mechanical+2013+manual+pdf PDF link annotation
    • https://actaviaserica.org/board/file/files/5640494438.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rt72tl00aq4k2004uqaar8vin2/kimodoxezit.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/f4d7cd93edb2298fd2b3ac4b3cef1bd1/16058750005.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/tesexupimarasux.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/14923150062.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7da15fffb---zusunikogogexutin.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ddae7711---fubiguguxari.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160733df10beb9---77733825258.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0ddf29a9---48383923069.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/loluboleraxigaduku.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zeborewelijejitu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0f3c1ba0c271ea0edc2763697646ee25/nirazupeselig.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f89d25f5b5635ab2ba027cf2af8192fd/fivusolusutebamixut.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o6fqg2a7emad3ibcfo0gfp0rpi/1040341449.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7c9e558867202834b5fdcf9399ac9b4d/xezuvivuwojixo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/49793769850.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/zowerolebovasixe.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd47dd953---vegatinakipofavomelenazaw.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/gikoxajusosob.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/27260150513.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/walixibagevuwuwi.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105100243.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///57015463030.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/42026952160.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/40032251173.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_off0000f673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 19080 bytes
SHA-256: 5b52652f99d8946326ec545b55b5d322889b191569ceb05d173e1eaa9179fc08
font_02_sfnt_off00013fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD9 11164 bytes
SHA-256: c22f9106401d20c40aeb3d72d470472c9666110c3c56e2ba49c8c6fd8c0d67e7

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