Malicious PDF — malware analysis report

Static analysis result for SHA-256 f814fd6e059e2c6d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 07:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d30e84499a79999c027ec15cadcd6d0 SHA-1: 67b27a06db6e50d35860afb58d081afd13573a7c SHA-256: f814fd6e059e2c6dcfb5a0754becff09f98c101eafbc0084a63751a7b46d2771
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=android+app+closing PDF link annotation
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/74eecf27a4bc98be6653e77ef08b8d2d/pibutami.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161441df1597df---95810505796.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tavumunafixivenubunosiled.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/37225213917.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/sajokagebiwebovonepap.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/wanodevefipufas.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/finevokopaxorede.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/8490518130.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/sisebutonikitexevedi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161430574b41c7---88479483715.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/22837714657.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/9811380044.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6a58e7268e5e410a4d9c8473f4ed7e46/mawakonamovobadorurekote.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/fisaxasetibifikigi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342508ec2ca---xonagizotaxufuzelovogago.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/xitakawawopam.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/98212189189.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/46287089614.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/76384242134.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/xuleson.pdfIn PDF document text
    • http://esipro.be/userfiles/file/xezaramifajolaxekifa.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305049af605---detegizodeseruvo.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/43134107377.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/62417472348.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/kewirafitunelifomi.pdfIn PDF document text
    • https://quizai.com/uploads/files/moxolenegekarimasajex.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_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 10440 bytes
SHA-256: 80156a1fb185081a90a1c3c3499f61bb20b609237a9a0f2e63710fb15ebc8738
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 17552 bytes
SHA-256: 66ef6f634e952cb5e051ec06f09696f2818012a69b0f87b23e5928e856258b5c
font_02_sfnt_off000127a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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