Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59e8c25832ae5c8…

MALICIOUS

PDF

78.4 KB Created: 2021-08-20 09:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5ccdc77582d7e6516492b1736043c3b6 SHA-1: 88ac772a5bfd148819b0fa808a131050466f3f8c SHA-256: b59e8c25832ae5c8de8d99605601cba5532490649a5f05f1eee462039277f680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is a primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=nitro+type+auto+typer+github PDF link annotation
    • http://beamstraffic.ae/amb/userfiles/file/mefutemopujenumasudi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1f92c50b---kowimeben.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6b5d54b9c32e39480194c5bcc2c1c37c/42653575968.pdfIn PDF document text
    • http://candientushinko.com/images/file/37513529710.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/64074355672.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/bonapubumusefo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4de20c527f32dda201908a04cb2c0ebe/52656326120.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/fasakizotagomufiruz.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdbe2ab11c---16664791194.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rv0esqp6559f3vthob4880qipk/76551282174.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/50143378289.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ksfa09q3hil3ig148fo2pfv6fp/72178447325.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/48099726392.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafcf95785e---tekevebi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/40663817522.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/11802544731.pdfIn PDF document text
    • https://kimcert.net/E/file/25355899385.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/66290007570.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/bigox.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/181d423324e9e4b0d4ee9290a0e5c724/30256596965.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/21086162805.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_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 10544 bytes
SHA-256: 919efc13b7dd78ac7d8c189524a88ecfb03b2d6643adc5e70adfef6b0964376f
font_02_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 16756 bytes
SHA-256: 52b3f7ba1a90baf9695fdb820a0b8dc35846403d4cb40ae0f5bdeae6ae41faa1