Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af369c5d6de16ea…

MALICIOUS

PDF

74.8 KB Created: 2021-06-25 14:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b3f80da7d1cdf4820504f96eae01742 SHA-1: 8f6559f1eee5bc0c3a176c611ff25ba9a8819bb1 SHA-256: 8af369c5d6de16ea53a85534508e7a241dcb94d67cc93c0e7272d851a763c5f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The primary attack pattern involves luring users to click on these links, which likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=compound+element+mixture+examples
    • http://deltastal.ru/userfiles/file/27232355776.pdf
    • http://ncabhsa.com/clients/875427/File/61811344027.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a48dd7644ea---59987074656.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/c33i1aiijjfa6o3cmr5k3ol61r/44593793256.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27b22d6d1f---kuvifinomejivosetakojufo.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/6b4da57b13f2ce1315d38f20bc1ba8ea/gikujapemexorelaju.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/3of1h6rmhg7d3nu1ua4jrkhash/49884481418.pdf
    • http://flomojapan.com/upload/files/zesov.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/75592813205.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd468b6c6---visoxumavarodisedajiz.pdf
    • https://amthanhanhsangchinhhang.vn/upload/files/balobegikuxunilojubupiwa.pdf
    • https://lawrenceyezersky.com/userfiles/file/xorosutupanopalu.pdf
    • http://accessiblevehicleservices.com/userfiles/file/12015476198.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/be52589eeecd1cecf3007e5e9548972a/68856985435.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b95d0bb7ccfb44536498a184de8dcef/sanulikamikigizewugira.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c9f9d2be---65064193397.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c49e.bin
4a679b516c3180b9afd99f3bcfddbd6506882d7e996caadd32c2a7085c3abc35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC49E 10784 bytes
font_01_sfnt_off0000dd73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 16792 bytes
font_02_sfnt_off0000f585.bin
0bd4f3032636c950c2d91dec2a8b5e4722206a20da78855658da368915583633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 15936 bytes

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