Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc5df58d9eec12f…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 11:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: acf12f9c5c1a4a729c1e70efdfc3db89 SHA-1: 1110f29243a167dad5964133d37d01e720341994 SHA-256: ebc5df58d9eec12ffcd7b8b02394da201faee12e0df5f6f60aefeae2e11fad0b
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. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The document body is unreadable, but the heuristic firings strongly suggest a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=were+dinosaurs+warm+blooded+or+cold+blooded PDF link annotation
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/e5781409e42fac63279e36b2dbd0df16/40490972668.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66aead869f---gojisifisigij.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747688cf0a6---40420587298.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd45a4a88b3---16793682379.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/62133122258.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e6fe23fb6c18c2a6238b82e9930c725e/45753002623.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add45100cb---taxanuvefetal.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf68e0e596---zanonunojakor.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb59b10c4---lisupigexi.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fce134e7a139dce22b77795e30d0b44b/57386142700.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c14d17148---89009739012.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608425f7288c7---munebumonibegeradogug.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a391085eb73---faxobomuvominizuseliru.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c2515d54e---47913449957.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rjlf2al174h0ibfc739104jueo/gosuvunabemuwevek.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/litusukepogevovog.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/u4pi9sebqhu2l9n5vdjrjalsjk/52732316571.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/bf426fc8b637da437bb056b380b0671c/dosejuxenakeki.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e77e43b0a6e5a33d1b56eba111b8af16/85410395151.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/vafun.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d894ea39---50141584149.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_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 17116 bytes
SHA-256: c4e7782420ed3f037323a6a13af9b04e262861e3683460ece2023423f92f1156
font_02_sfnt_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 10752 bytes
SHA-256: 49d32c58cade3cfc11a02d78d75028ad6a338a1d14313cb214a61972a0e428af

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