Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d5126bced05044…

MALICIOUS

PDF

87.2 KB Created: 2021-08-13 16:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c3c641b0998617db3b2d7bc60155c1d SHA-1: 87206b68fd4415e11fab5a57d19a9f0d5cf7266e SHA-256: 46d5126bced05044f2d1f9691547d21881accd62e46fb9ccb9e19d7f30567949
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The file's structure and embedded URLs indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/868a0fa27e1e4e8c5eaaa15974ddfb49/73858780465.pdf In PDF document text
    • http://laureysnv.be/uploads/files/69587527463.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6457ae12---powewodoza.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/2b4024dfa1fb44e8e9a5d3e86f355d66/49227564845.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210812_8FDB3BE1E135F65D.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2ef323bdf17d74994ccab84ca17b7f8a/dosabotosidi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/43417554691.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/lufudogosufe.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/jpd16031q0r69nrud0ie6k5ag7/91245286814.pdfIn PDF document text
    • https://papiratisk.cz/soubory/89272476056.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/89008088145.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89f1438bd---zipoxuzejusafarugolap.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/ganudadifowesekukir.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/metanojovi.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/40118470225.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tutijotemasazorar.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b75bf192---beguse.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/76045891350.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ca17533ac---vaxogakogojaxinivusikufa.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tuwanawamiruvomitibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mason%27s+rules+of+orderPDF 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_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 10284 bytes
SHA-256: 6f1c6098f86baee8187c83d181283cdc3da6e8bea4dd997ec723f2eaae3cda72
font_01_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 17344 bytes
SHA-256: 018f29933589a93a15d18d13c7fe5662d250e2d95719385422760751bf27879a
font_02_sfnt_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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