Malicious PDF — malware analysis report

Static analysis result for SHA-256 962a6e05f605f5bc…

MALICIOUS

PDF

104.0 KB Created: 2021-09-06 00:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d9864308f4410a40ef7216bd9d22078 SHA-1: bf3f0c95e9000ddf04cbf9f7ff50d0153a2876c2 SHA-256: 962a6e05f605f5bc53e8e5c1ad4313897b3c63438b9e245d1e0a54d847891140
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lead the user to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/660iv9megtlmuvrt8t263j9koe/57885610097.pdf In PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kelewemunowufajadexe.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/193509eb3a986a95725616c830ea8580/91560154742.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ccb73aa3---30122829218.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/jezejetavosir.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/da027fc5e9dbebf1e901fc8402ace1ba/jikuvanim.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610841b24900a---puzegudizu.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/nomukaloguxojosubevokov.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3620b9c2---niribamezekabetidumok.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/29909536165.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/62373795102.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/65693018340.pdfIn PDF document text
    • http://asfalon.com/__files/file/taxovajiguxevenavalalib.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/venegepesolexonobi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0bf18c989---togosopijiti.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/80174021328.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16109e65b17653---siripuforufesobexareb.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1dbdrj7slh4cjq61eanivnu3jo/rajumabe.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109051702594714.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93d32ab351---15571116986.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ca8f6fc---49397584730.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/v00f7ftrg58ild8v339omvahg3/lizowukawunofuxigawira.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/26140973049.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607406939669f---xenorixajapizam.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/kakusi.pdfIn PDF document text
    • https://superchills.com/userfiles/file/91811311473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mofa+f%C3%BChrerschein+fragebogen+pdfPDF 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_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001404c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404C 11080 bytes
SHA-256: d1864d631ce9a2a32119eed9eb17662f923293795134349d5ecc0f1155695d58
font_02_sfnt_off00015985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15985 21424 bytes
SHA-256: 5ca5a2039a1eba90974315428a134e6021966c0e9ba36074de5d7dcc96843822

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