Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c043f0bc961b8b6…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 05:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a5605cc7ac42ac018005a1800b61d8d SHA-1: ef016f1f7864cdc8b6185bfc9e3da87b066d3a7d SHA-256: 3c043f0bc961b8b61fcf520e635f23517b1a72b570cd50ff1db988e0e2d66f9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a network of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=story+reading+worksheets+for+kindergarten PDF link annotation
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610edba077881---49054063576.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/29291099163.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848d35a802e---detowalolexamadalifawom.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/mozixuvegit.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/71343406121.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcb552a093---jusipakifin.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/96478394318.pdfIn PDF document text
    • https://ancoraeducacion.com/images/93483431711.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160714b44cb959---26506152946.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e2093296---3027699790.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/lozirikuvizugibof.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/rokofexarikikegukutowobev.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/737d3cd07930390c188459f329bdd8cb/savoguzijusivosul.pdfIn PDF document text
    • https://technoray-medical.com/userfiles/file/xugorod.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/86437270236.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/rinejiwaladozotir.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/26371227084.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47182c4180---famupifazadopujimamumek.pdfIn PDF document text
    • http://geasit.it/userfiles/files/35360623940.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/76764981910.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/65770204693.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/71405010358.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/31049082101.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dc8b84f38---rimopifir.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a29babe8ed8---23555879013.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8f9c0a5e5dcfab5c72823c4ac92f1046/rasobeviwitevekol.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef7e84533---risifinanewejeropowuw.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_off0000bdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 17176 bytes
SHA-256: 9eb8d5959c29a9b7da26d8d4d4bb95b5cb9f0d0556cd219cf383ee32f16bcbce
font_02_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 10956 bytes
SHA-256: 952ca34e55c5631a3504213e57aad4b280001768f70111caf63fc9cb3f052cd4

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