Malicious PDF — malware analysis report

Static analysis result for SHA-256 0942f09e1e7388e1…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 11:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b89df6e06af18b7998067df8ccc21331 SHA-1: cbce1ae45b6119351a5965af8583af1a7bcd2475 SHA-256: 0942f09e1e7388e18660485ca8a2afd788c8f44780bb8b068145d8d29a40288b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=fibre+optic+communication+system+pdf PDF link annotation
    • http://myucmas.com/userfiles/file/buzatejipoj.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/76391733373.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/68539733848.pdfIn PDF document text
    • http://pmmagic.vn/userfiles/file/wasesun.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786bc7e5cac---12558748117.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202108160641518384.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e915a7e3432---99831266119.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/dozovabinipag.pdfIn PDF document text
    • https://tipresentoio.it/images/file/zaxofusabadu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb59207e4d---vosem.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/27d4b414110d1dd19bdef7387ecf8198/95329540495.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/10842581889.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8a84bed3---jokofikeluxewaxi.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/fa28b11cae21a8c425537f33911f5742/19775469688.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jt180nnl03a5fna1tsgfhagkd3/50344372639.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cb982db2bfc8e60659dac3f72d3d5b8e/wuzobozapapitakiludapezok.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/62705959469.pdfIn PDF document text
    • https://assistenza-termica.it/file/87150544396.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/21245800469.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/22900928387.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/66863010179.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/noperirinamulubadetenuraf.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/4r6d7q7didfshk4vbgsrc4nrll/zolilowewemomasisi.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/5547227572.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_off0000c620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC620 11064 bytes
SHA-256: 1d2b0ebcd98b2fd0df888d477989041d8ad4e33a0a0d90b4b851e49c4f6959ed
font_01_sfnt_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 17752 bytes
SHA-256: a09bc262db87a21b7d6768660e701108d079902d6b443beeb73bc7fb7b38550a
font_02_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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