Malicious PDF — malware analysis report

Static analysis result for SHA-256 968fab550c417a6c…

MALICIOUS

PDF

80.0 KB Created: 2021-07-12 17:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db5d6a111ee1066f204ada9ae4aae8ee SHA-1: 5856dc941eb63677182bd4d87dd9f1bcc74141d5 SHA-256: 968fab550c417a6cd08dd77d90c544912fc1310d898ff7a4e8760ed1a7c0fb08
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8ff0765722b2bc41b2f4a17fcc6d8cf/pizegaze.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/02b8f2b0b84730cd654d2e717836802f/35141138061.pdf
    • http://nhs1980alumni.com/clients/878257/File/34483062900.pdf
    • https://bruceleevideos.org/images/file/28615375292.pdf
    • http://edu-family72.ru/content/images/uploads/file/xunatusotaduzuza.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/uguhqg9ppav46snqaq8hodlf0e/50049906032.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14afe5a35.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b93e24757a5fb78e2ea6ee584be27638/fegejogusuxoxilevimunubo.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cabc20404755ec10abff1ca338d3658f/ludotezir.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6dbba95cca9a1dadf8d93981611ef3cd/66150315298.pdf
    • https://alternativecarrepair.com/userfiles/file/woseriroxopimonara.pdf
    • http://www.lnk-creation.fr/upload/file/14523637522.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=3d+parametric+graphing+calculator
    • 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_off0000d39b.bin
80ae6d2278668b996f803c958cee30a96e89e8bb720a6a7bd9e4a2ba8fed7ea7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 17784 bytes
font_01_sfnt_off00010285.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 16792 bytes
font_02_sfnt_off00011a9c.bin
061a5ce1cb1a50243675dcaddd6bc5ea68c9acd67a201b481f5ad5d6417fc428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 10968 bytes

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