Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8783a8632c2b5ae…

MALICIOUS

PDF

84.0 KB Created: 2021-07-18 08:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8fe78e8d001eb2a120cc83449adf2a11 SHA-1: b66ac7fe19a843f3a90cc37afe6dd782b7891ed7 SHA-256: f8783a8632c2b5ae7affd699624b82e5159861c97cfe3d830537923e9a9ea2a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xo-sound.ru/userfiles/file/nawepufilidaxupefozabe.pdf In PDF document text
    • http://qca.ch/userfiles/file/lovogeda.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/77524288148.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/xajil.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0a0ed8cd401a2ceed1dca3b284a8b97f/60373762163.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7c1648b6f9a8b0cb5d9d7f8165792c83/xidigidimemerogasube.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/2c2o7otns3k3mpngqimuot66er/46869759510.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/egcofdtig26lirijk68fvb9bfq/supiwa.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a0a96278---60007602584.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/76269637ea191d77e7c197dc3cfc98a0/xogezup.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5219fc5f7e---majutofazapizaleve.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/84106927263.pdfIn PDF document text
    • https://soechi.net/userfiles/file/jotelimajomuxavidino.pdfIn PDF document text
    • https://diphong.com/uploads/xatawa.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/gexalosokogefugit.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607282fa7d413---32061088619.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/02c4d3475d6cfc3843777bda1894263b/soradivipagawab.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/cp5rnpo2ea09iqqedneuoi4u91/delofumozetanesivutet.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789a9b9b69c---46107076972.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/13448847549.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/fiposesuvadukebuzadax.pdfIn PDF document text
    • https://noddy.nu/images/file/woraxunar.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6089ea3a2e---85894372251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=red+itchy+patches+on+facePDF 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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 10732 bytes
SHA-256: 0817507bfec0c68262b99f4c6407851c307f4eebafd223481b85f1b05274b250
font_02_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 16420 bytes
SHA-256: db249751096b1704738a2c088c852620924957853dac405e5390d0f3be8592de

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