Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9b17d490cf4b7d…

MALICIOUS

PDF

110.3 KB Created: 2021-08-21 23:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52f0f0f4fc3931e5510d2cfac0ba87ec SHA-1: eb3bc4e158f81e37780050b1e3c28353b9dc13b6 SHA-256: cc9b17d490cf4b7d8fb9bcfbdb8f7bf8be31f4cbddc7775486052279a3cdef4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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 https://philabc.ru/uplcv?utm_term=olivier+blanchard+macroeconomics+4th+edition+pdf PDF link annotation
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/v7g3c8gstrci9toqen290h0ir7/tonodufinotup.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3824e96bf68bc583e3771fa367d8f59/53115593593.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/sifawis.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/xebejoxubave.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/o5hbrp8t92s3koa96qo4m79ghf/wogubelaxugowinibo.pdfIn PDF document text
    • https://davaocarrental.com/images/file/2629721132.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717303a617c---88047345065.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/29588857613.pdfIn PDF document text
    • http://centronegozi.com/public/66845492986.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/29605144266.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205df4ca3d---fikibowilejikof.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/9vdk3cvg4dsk5tqtrjd0dqgnef/rasewirawe.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210731090253173.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca567a168b---67285790578.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/96bb20ba58c4f823951e250fa4b20dc9/25653660812.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094c5e2bedd5---69492429895.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/simede.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/81247661617.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/9579008896.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/jadid.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/pexatikeboxikimidajufa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a954e6d4a3c---16848572223.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/18468464614.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/54764190759.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25dbbff39---mosotobaf.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b732e304---kuvamigapejijepekivapar.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/texuxexuworevixezunipal.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9b4a5b27b20985a6e780db07cccd1ef/90199214785.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_off0001464f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464F 11192 bytes
SHA-256: a0e7c9e022107d80c7fea9562cb7d6ca4ae87fc361cf99bdc71ea018651c4aed
font_01_sfnt_off00016027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16027 19024 bytes
SHA-256: bf86266a7cf616adabf908848a69e65e3cafd2da98f3b8879c49383f24d967e2
font_02_sfnt_off0001911e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1911E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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