Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c2f1350b5e7d0f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 19:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d1b2618c644cb30129282d94a45d68e SHA-1: f3778e0a943d9483ed8c819b8f24a4544836d9c7 SHA-256: e7c2f1350b5e7d0fb97b84e2f8affd43f0e995572b2ae7629e1f4cf781c8cc0c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be disposable or compromised, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the malformed stream length and the nature of the URLs point towards an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bmcnx.com/userfiles/file/funosojofozuxoximifi.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/44030769033.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/91127590179.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/tigawofuduxusuzusas.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/pilunozaxakotu.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/64097871714.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/6973092930.pdfIn PDF document text
    • http://stefani.cz/fck/file/wisurag.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/ratojesadiwolajazim.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/49313352526.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/61739873778.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1a689e0adf2cf40380127845e2e6a115/23346350737.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b367bace8---gisumefixexas.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/70996795294.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/tidiw.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161365f910d80e---xonofituloxetufesanowozu.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/muxonakagakifekunibop.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/26517928643.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/71007068467.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/7779852779.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/54804984618.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/sipulurodorixukukiwax.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h7q0mavr3mf04he13p5c8uv9ie/mowisesexuboxoturenagoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=30+rojullo+preminchadam+ela+movie+download+in+movierulzPDF 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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 17692 bytes
SHA-256: 42831731cc76b7a888d73b9b9996049c3c685629f222cca6ab1573f78cd32f80
font_02_sfnt_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 11152 bytes
SHA-256: 48f8691922b8daa3e68d75dbb923be5450866248c90d42960527205db4090dcc

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