Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84eb09690208294…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 06:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6a6a310aa3d925f13fad236829f6512 SHA-1: 3ec68e8fee481feab9a1f75598e8985c44ac2927 SHA-256: c84eb09690208294b6f9ca61d9c3c26f8000598f665b328fe1132acff4a2096a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates malicious intent. While no scripts were directly extracted, the nature of the links and the ClamAV detection ('Pdf.Phishing.Trojan') point towards a phishing or trojan delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=basics+of+anesthesia+7th+edition+pdf+download PDF link annotation
    • http://buydecor.ru/uploads/files/69979520087.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/luzukekomumejisotebawuwax.pdfIn PDF document text
    • https://businesslife.com/content/files/97159411790.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/3456735955.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd6892aae---fuwujigememukonokadukejiw.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/12268826957.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/65818643302.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/80423559391.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/zukagedepazidabe.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/wapepelapub.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/kedubuvedezenejubok.pdfIn PDF document text
    • http://chamdure.com/DATA/files/pajodawepalepumarutu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0b42c8fb962fc5e74350c7c55509242c/debilix.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ceec9e874d1ef4fb20789487c33ae15c/muxiguwujin.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/xobosofanikasamuda.pdfIn PDF document text
    • https://questyme.com/userfiles/file/73991526438.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/gusarinozoxiwigo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607766a2696f1---23203163194.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/vixatojezewumule.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c073b7d9f34---bejat.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/60945308566.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/eskqc9e8jd1jc8bps6f06lapsf/60184338068.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/detopakiradi.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/59963643690.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2abc38f7cf12b2d1c9ad3e1a215c26bd/25350211691.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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 19084 bytes
SHA-256: cf2128af6421ef1c1e0299fd01a2dc414e0ac31b83f7e7259bd9342b491a3a72
font_02_sfnt_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10808 bytes
SHA-256: 118712876737409edc06b9d75704a328324f2c495caf5190781ed1570c3be1f7

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