Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c273bdfc4e64b1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 16:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bad731d637c1658203aac3d2961b4f21 SHA-1: b916a80a3390f2c86ded6d03fba1a3624891da59 SHA-256: 25c273bdfc4e64b1c05e62e2bb55c58b2c3aa633602e340ca7ffe9378f81271f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous links pointing to compromised WordPress sites. The ML classifier strongly suggests malicious intent, and ClamAV detection confirms this, identifying it as 'Pdf.Phishing.Trojan'. The document likely serves to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ketchas.ru/uplcv?utm_term=new+product+development+examples+pdf PDF link annotation
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3f973faa6---14382395438.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f194e8f0f1---nasotagakisogodupiroji.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/merowevurik.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/86532986131.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/26244953848.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/63aac909c368574d55f2475288497ba0/3907584254.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/80520891697.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gomomapaximi.pdfIn PDF document text
    • http://614move.com/clients/4890/File/12134308208.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/32843891958.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/20081793700.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa38c3e1f7---sutuwojabutemitolixanojad.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/81934967351.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kojepasikakokarajafevema.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/rulefowivuvusefexopebiweb.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/foxiki.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/46473700213.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883aca3b30d---togazesusazibazesejak.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/12981848630.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d24992988---wugiw.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9fut99asmfcvvbtb2gqbe6k5bi/padigitanewamisa.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c56a0f92b62---koviwafu.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/68176934117.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/84731410970.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rjn5pvnttot32i6qcj5javackn/53003145066.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_off0000d7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F2 11020 bytes
SHA-256: ad59f9ceee6a213fb9fc7c7af488245169e99255a9c62c979eaa54ed78da082b
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 17368 bytes
SHA-256: c58282b994f11c565b270791b9a0677ad8e021596bb37e55a049d3a411fb1a62
font_02_sfnt_off00011e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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