Malicious PDF — malware analysis report

Static analysis result for SHA-256 40af4aa5ab8e209f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 11:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: da7a6365031699a03fc7d79495744709 SHA-1: 105c7899638396e23b89fb6c1ce32e70d8f401ad SHA-256: 40af4aa5ab8e209f593e7313a5c277d80b1c2347f07a5d6dec5255b36148d0d6
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, directing users to multiple compromised WordPress sites and other domains, which is a common tactic for phishing or distributing further malware. The presence of numerous external URIs and links to potentially compromised CMS upload storage suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=ghatna+chakra+science+pdf+railway PDF link annotation
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/nscvbgg7h6pk1b89olg6fmpf73/magex.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/1812409230.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e702f98d16---menunedavugogubiwigiz.pdfIn PDF document text
    • http://stroi-sistema.ru/img/40867560827.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/743dd136e0cc2c0fba5eadc97c10c2c7/fopubarebikoja.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/legidazisisogugivizurisag.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/2877043644.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/66885377390.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/83385776276.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e07fcbf---gufomikuz.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/31611448098.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/metetogefifuwelojovujom.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/dusufabavagudob.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/wakodofidudisitajubam.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/pupazur.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kosanevapu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479557e2a9---38628739147.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5bdb5d54---99122268850.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/33879801122.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/90315625588.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446628c378---39904912135.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/zalazibegidulobix.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_off0000bd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 10928 bytes
SHA-256: e5eb4c0eee394e68215daa91e5202619d9d14be7c1e8ec33f0ef04eaec710741
font_01_sfnt_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 18656 bytes
SHA-256: 3d1ababda4d9918dfeb96d707ffeec0f2c9a25652d36a977cdd6b98cf5cfae98
font_02_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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