Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24b59435c156e01…

MALICIOUS

PDF

81.5 KB Created: 2021-06-29 02:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fb08c2cc627fc1fe41abd8ac869621b SHA-1: 47487cb00b18add0865bdf5bec645bf35324040d SHA-256: e24b59435c156e01ce0fab2e2b86d56d80f297c4f11ced7b020f91b46c6f7208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving a malicious payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://oniceh.ru/uplcv?utm_term=dispersion+scattering+interference+and+diffraction PDF link annotation
    • https://congchunghadong.com/uploads/files/bimunolewa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf92fcafef---daxebenilawad.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/59441685527.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/928d326ee1d91a2682fe317afc87f074/daxelozuvagukeromokowasa.pdfIn PDF document text
    • https://chpcentre.com/files/file/moseveninixolok.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/59351129944.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/sixesof.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/vinifufigezi.pdfIn PDF document text
    • http://uco-kampen.com/media/files/lorexiwotuguv.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/9f1a9b7476ec20954798eed929882270/sixaroruviwinazediluzizuw.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d790528888f---7888953818.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3d714f7b3a4b61274191e6d1e366ccaf/54618670271.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/52097898809.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/56582698007.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6178c281a58d260ae7c6c1352b93c501/26166683136.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bababad5cf8---58693582407.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607677836812a---jevopanofamiwiravusar.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4b7e8a53161cbcf6d2552b198ec6a031/sevudegavizopumozaroweb.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/fepowapopuned.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/vorijuwafazupawezulatif.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/8daea0c0f4e7466c7b75a9c17d4c137c/xaburexe.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/roponarojajilirezap.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/95155714302.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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48A 16832 bytes
SHA-256: 952e0d67d6386b7f354fe503535136ea804a58bc46be6c0e5f13a26d10c71bc7
font_02_sfnt_off00011fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 10752 bytes
SHA-256: e4225c6e112cbf41d2f3cf5a2cbd870e8737220877e22a353db4d6b772519efe

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