Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc49e1a2d8708e1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 13:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a5b6a0186a75c1d16e7150309cfc01c SHA-1: 37e968ba25d153c8e60c5e7aa66499b588760871 SHA-256: cfc49e1a2d8708e157b347c326258f8dc390ee76023dd279771bcc101e16e5e6
196 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update. While no scripts were directly extracted, the presence of external URIs and the nature of the lure suggest it likely leads to a malicious payload download or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=come+cambiare+programma+predefinito+per+aprire+un+file+android PDF link annotation
    • https://pbpkrosno.com/fckfile/44047369693.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/xurolutozabiz.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///56520070339.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/puputowebuvunose.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614174ebd0648---24116650435.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/20398187240.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/kupalonutugegewedolopup.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/soxoraboko.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/jegenarefegarisitasidil.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/kurelevu.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/pupufum.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210910024253.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/vefemivajoxo.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/rokosagu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/46271630769.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/88543719665.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/28480134589.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/61216859621.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/jofisaku.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366cc81ec1d---lamigekolere.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140e85b2e8fe---89286507260.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_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 11064 bytes
SHA-256: bfbc3e213c61cbcee0f1fc43ca1bd4b9d2289b95d7ade4d15f6a335a99cdab10
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 17624 bytes
SHA-256: bd80a6fe001d7ec4a58dc1125e3e7995b8a05231308ec4f6775f13f735c370f6

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