Malicious PDF — malware analysis report

Static analysis result for SHA-256 594da9962c0993cd…

MALICIOUS

PDF

76.5 KB Created: 2021-09-01 02:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fb469cb0b907233e7bda25d8b898cfea SHA-1: db25098df131564e95bdb58391c527b203013aa0 SHA-256: 594da9962c0993cd2bccc516be32fa40bc3c96584817ac6d797265d915ff3bd7
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs hosted on compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c285fe3681---39728305833.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a54087c2d20a26e26ff0eaf4db2cc591/35362020808.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/jisebofenaguxitezibiva.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/pamowaxesazubiwejerepime.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210705102523.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052323590170554.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/97689007419.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089a665ecb4d---56203723314.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/78390402287.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/37697863376.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3acc58de---lixigutipiginew.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/4995323470.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16297132277090.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/34cd82ce8ce222bf20ec5357cea9f4e8/pugepigodo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161101a72082ca---4873798129.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6f4eb076---lisanigegefatixuz.pdfIn PDF document text
    • http://valaptop.com/ImagesVA/file/88355983445.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/69c8d5c43b16eef7492d168ab26ca0a0/tajopino.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b9bdbb52---lotibibodokalen.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c963e1a5280---30900758927.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/ginalomegimozix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=accounting+for+joint+ventures+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_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 10864 bytes
SHA-256: 3a7de7b539c7d5f5b3e4c713e8ba409da9acd54d4783a0e45965cdf9ce3824df
font_01_sfnt_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 16780 bytes
SHA-256: b22f944d8406912d855fb453fc0e487ef4296ef98cec516432f123991335680c
font_02_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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