Malicious PDF — malware analysis report

Static analysis result for SHA-256 b213f9976eed2ff6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-07 23:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 665ceaeb37aa143beda258c165188bb0 SHA-1: 0cffbf147c6aef1c66053cc04fcc2974ad899891 SHA-256: b213f9976eed2ff6dc257cb90996fe00ede204f80be672a55cc95551d8270fe3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. Heuristics indicate these are likely malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged the file as malicious. The primary function appears to be redirecting users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae905e68471---dususesivapenomafogidug.pdf In PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/54c60d981a5b89ce19ccdeeb61e1f7c6/pupiroli.pdfIn PDF document text
    • https://yuktogel.com/contents//files/4509706571.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/teweniwogobinaxigivu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/76127693810.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/10474918813.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/gamojilexemuvedurawasi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092c0cf85bfa---woneja.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/mli59ef2fdfmbtpt8had3h17ev/44636901013.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/fegumo.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q7gpga5bths315r3ao0vb5gav0/19760329024.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jobijolamafazub.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/fonudebovaxun.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd608107e4b---getokafenujujebanosironub.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f952ca2e1db22ca778ed55486fb24faf/teluzanoripusup.pdfIn PDF document text
    • https://aaaxxion.info/images/file/10405966775.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8a6b93336---vuzofigivipox.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/84436288124.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/pusupimumadisalilazo.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1edd13808---muvidimuvedixo.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7519354bbeca0aa6d27643fc93fb5d82/10876017332.pdfIn PDF document text
    • http://apcmagon.com/userfiles/nobawutisanuk.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/60672248335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=simple+index+laws+worksheet+tesPDF link annotation
    • 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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 11012 bytes
SHA-256: 7da6fa768d4202f01b6fac48021ccfc15baef0a69afa2137c65c6dc22fe1388b
font_01_sfnt_off0000cd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2C 14568 bytes
SHA-256: 938b0f1e7dd3c847504ce46f43d5878d23b58c2685812aa9a03a3c1b2965afd1
font_02_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.