Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb55e587d351826…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 07:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61018800e6bd8a517f5e7b24cfc7ee40 SHA-1: 07d4c8b7d20a0f22509acabf4a191ec478a966b8 SHA-256: 0cb55e587d3518268d657d437af0c65dcf50f178a0efb6186875891829d84c0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://razaviota.ir/basefile/razaviotair/files/ruzasamoxetiruk.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/nuxituzafuwofefoxesuzavaw.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075481a1cfd9---99661237680.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dd0ed451c---15284103742.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/bupekuzutun.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/rozaxubaf.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16117a9d4213e6---29341855939.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/62782466757.pdfIn PDF document text
    • http://chinalabware.net/d/files/pogowino.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8e50c30a346461e192a8596d4b447a3/66740676923.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff3fec4ac---45296458145.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a900881c0e5---wulajiwiwoturi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c14757b46---sazixodudedizugo.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/naviluligawufikaxurekixaj.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/xeloparepakinivifuf.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a58814ca9---gejokubipotafigazere.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/goleleratufopoj.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d39d01c0---56491841302.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f46b836ee0e---91679835229.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qr120a9g782rdheuianbr8gsbt/komuwimuwegowatar.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0c018496---pabebaxexusadapo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6b18c5855---zubeviminitoxiguzuximub.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/tusow.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2301f0b6f5---laladumarilowasoxakik.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1d4bb5345---23983238643.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/kedugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=norma+de+calidad+iso+9001+version+2008+pdfPDF 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_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 11396 bytes
SHA-256: bdbce7b0ea6aee07d886c62aa02f700b4b1124423d7c0b7d6b5909d378efa6e8
font_02_sfnt_off0000f894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF894 17236 bytes
SHA-256: 993e3b0f37b5b75d01402f01fcc3aafece821ba69763100b0681ff3780d88d84

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