Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed5622235629bb3…

MALICIOUS

PDF

95.7 KB Created: 2021-07-30 12:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c792c85d6ad8ac676ff86469770a888 SHA-1: 57a56120392a883db01708811aba9f7fea8ecf6f SHA-256: 1ed5622235629bb37d50473958cb1f08ddea762a499797e4b793345b720500e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://pistant.ru/uplcv?utm_term=bloons+td+6+free+download+pc+hack
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084be389df9e---borevafaxeviz.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c098676aa3e---totaxaj.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0689a457---7836642365.pdf
    • http://kripasec.com/userfiles/file/piwoxudijavejosa.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8fd858ca877b86f2bff8d5ee97176024/pifam.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/015cbe102e128abd2d7d52cf9df7f352/litijoseb.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3ku8udba3nnav4i2011kul9re5/51580919563.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/53579414886.pdf
    • https://agermag.ro/mm/file/suraviwun.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1af1af00---63241430608.pdf
    • https://allcreaturesinc.com/files/files/19409846498.pdf
    • https://castel.ro/userfiles/file/77536023291.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/kidefifugipifemonedubote.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/211e48aa2adfc58bd21f215d058917da/56492605416.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4e60c872dd65a638b7f37923d545f736/50709885088.pdf
    • http://ascensionchina.com/userfiles/file/11193240044.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073a567e0965---rilolunaleluzunokomegapo.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607514ffed8f0---dixulawuvomaxosudaba.pdf
    • http://banphimchuot.com/userfiles/file/fazolukekajozubadinagifag.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/54cdf869ec8d78a6ff0aa38b58db2d4f/92357265731.pdf
    • https://natatourism.com/userfiles/files/25912109566.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/86187340020.pdf
    • http://vistobrasil.net/uploads/file/7161208796.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/di49jgsmqvkebrm0vrirbvfb23/vasitog.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160735011d667b---zugopixobixujaxexuresuwov.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/9145fc765dcb9af5f03dc0e9dc05e769/40413449987.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_off00010f5b.bin
e5464dd8786e3a814fe209fd62804773c2f1431c589f4f2ac5eb93c91465280b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 17256 bytes
font_01_sfnt_off00013c9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9B 16792 bytes
font_02_sfnt_off000154b2.bin
1a5848ea835151ba11e3e4ecfd1c4fa698cb87a86a14ced33273cdd57c5cc9d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x154B2 11024 bytes