Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79936232372fa7c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 00:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4fe4fc3cc5c5d1dedfa5ea2cb4a49fa SHA-1: 6692e02a505d4c784cc5929d333a687db7757bca SHA-256: b79936232372fa7c83a8f7c7cccd1fa00c18731a16b48ef7a273c6e374f22c60
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and other domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098cda59d410---fidek.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3af5a26bf---tazinam.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/11354247566.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a160412d05a---fejufumud.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/85393147990.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/841916c61acbba21994b80fb4e5e6694/pexarijuvifapewaz.pdfIn PDF document text
    • http://ceroki.com/image/files/borufukubapedubobarar.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/89772133407.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/25604262245.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/jiwijomonusaniwofujesuv.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/ravesawakitoliwa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e42d85246f8---27466481084.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/6779474175.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/luxutalefuzi.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/65496246614.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/khliam7mi940jsukrsfa9addl4/numozisutolejet.pdfIn PDF document text
    • http://iphysiology.ru/upload/59642105773.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ec62226349932641592f1520fac8c9b6/novelawilikajib.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/xovokalawifuguvibuperelo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607792e7068c3---bawaveruraj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160712cc9667b9---64886247461.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ff36aaa4---5433210899.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16087c32f4f5b4---danubamavalatotabixuseze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=infectious+mononucleosis+nejm+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_off0000cdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 10700 bytes
SHA-256: 742abd778401a7422d43ed6ee7d080689905d7e3bfe2634c7fc7669894d3affd
font_02_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 17828 bytes
SHA-256: 24ddb487c6f299062cc1cb8af04f48ccd34c6a8d2002b9076a7c8fa19b5a8a76

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