Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cf966906d00750…

MALICIOUS

PDF

81.6 KB Created: 2021-09-01 08:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0eb7cd0d90347d51bd309d551f826c2f SHA-1: 3519cd035b87f11c99d28abdd74a8621d6aab3e6 SHA-256: 64cf966906d00750610c02affee8cce39b9a539a36f5147e5150aa655a646e35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous external URIs and link farms hosted on compromised WordPress sites, suggesting a phishing or malicious content delivery attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of multiple compromised domains and link farms points to a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=silver+sonic+metal PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b9a2277a19f9cda8fe23130b46c4d982/fezaj.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/kawetedefexogakeferitawar.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc6256e5f0---79029166237.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16126be8bb06d1---20243958379.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/fazowexibipabexipoki.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/36959104182.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/rufivutip.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/fasemojiluvigu.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b714ed6377b---niwamulonapo.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/40433895358.pdfIn PDF document text
    • https://lapakunited.com/contents/files/64418418426.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/0d2c313286ea0004436aad2efadf5e07/xijikiwemofawavexebunaw.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48a3b3b0b9---58270233822.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/30424282610.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/xusenolo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714ba104f51---42791475246.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2pa5hr8i4kc25v9lm9g4aoc9n6/raxexogusobarofezupokif.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/6669017c8e4a4081e1042f4a5103c278/wubavik.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/71251951423.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429012408131.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611e4f3263fe1---kekeseban.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/332c2ca3683a8990dd01dc08886f24c5/20865687475.pdfIn PDF document text
    • http://iphysiology.ru/upload/buzikokurenuxu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0d561614f6fe395ce05081841656d8b2/ziginabul.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/rizop.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/b2lkboog62ggtmd4sfih4i6o92/wizaj.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_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 17508 bytes
SHA-256: 4125272707e30891df12d7f4ee7a1ed120552528356aeebc42b3e92f44108c3f
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 10532 bytes
SHA-256: 7b4fc8445a3939216eb6a31c8ce0e43d5c31175d31f33b2b5033577383ba847e
font_02_sfnt_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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