Malicious PDF — malware analysis report

Static analysis result for SHA-256 10accb7db3fa58d4…

MALICIOUS

PDF

81.4 KB Created: 2021-06-28 10:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1f8e9b92220d8b46f53ad4a80a28e07 SHA-1: 6db32a7c90cef306a60f19ecfeb6415bcbd2ac1f SHA-256: 10accb7db3fa58d4da99cd3413469a674050cbb1883e04d0dfffc6caef184396
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://changdahk.com/upload/76051603924.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kdn9uapsqjtp49pel4r2rvbq13/63956464681.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3dff9b6935a96e84019f74b066c10899/14923868713.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535e4bc54---95398489148.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c492eb8ac---lefaxuxarutijoluleke.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8741e576b---42308455857.pdf
    • https://acryl-bg.com/userfiles/file/kelupujemetarunipabazutu.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc212f4b1d5---76340225593.pdf
    • http://cuacuonnhaxuongbinhduong.com/upload/files/xunosewabupojez.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/47c19bda2d8fed53c9b235a7c38b7c5f/21703379218.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/l19fub2h8u238g070ovb7dinum/37708084676.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e72a39f3f---rofurobobotibojurukig.pdf
    • http://rialta.ie/userfiles/files/vutekuviwuzujujusunekuk.pdf
    • http://aimic.com/userfiles/file/ripemozukajutawabirin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=is+nuclear+energy+renewable+or+nonrenewable+and+why
    • 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_off0000dd84.bin
0fe9fc032c0034fc1a2a1f39dc54a043805913b49e5c03264070b6f5ed772038		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 10852 bytes
font_01_sfnt_off0000f660.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
font_02_sfnt_off00010e72.bin
8f2f3230fb929cb0283b717ab0b5a77e2d8eaa1f1e3e5ba330a830ee0c149fd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16340 bytes

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