Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c762f35e81ecab8…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 18:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ee2d164ba2973a086cdd805ff800dfd1 SHA-1: c7692a27170a5c290661cec8d490afbc070d1011 SHA-256: 7c762f35e81ecab877156523fe434fa3e15cdb0cfcb15aa701cd4ba2dfa66527
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick users into installing a browser extension or update, a common tactic for credential theft or malware installation. The presence of numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the overall structure and heuristic firings point towards a social engineering attack aiming to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=new+android+ios PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141101b58eb0---61422763000.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/pomimibawaxupaxav.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/43575428847.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109170051283052.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210904_D7321C0F15E400D3.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/gidekaxilagife.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/95850381632.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/jikapudaregobirokefe.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/pugokugubebubikivap.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4cb9bc085f87c986cffac729b3559e27/43923908522.pdfIn PDF document text
    • http://klinok-saintp.ru/files/60640596308.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90adbbba4---weluzajuxunegefebelafe.pdfIn PDF document text
    • https://basisnomor.com/contents/files/dusosapogefawuwin.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/lomata.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/83597714336.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/sinerixupofozada.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/xujorunowajojobote.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/sodabekef.pdfIn PDF document text
    • https://computerzone.pk/file/54944937700.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/3411240193.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/85799822645.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/38637049526.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/96929161355.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_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 10160 bytes
SHA-256: 8ef9fbc3fa69122f0513f4378c52cf1cdf3388799d68896e523783dc5daf7cb4
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 20052 bytes
SHA-256: 76310053d37567d3a7e2d4a3fc6c482cacfcd2273951d2972d2733b1e549bf42
font_02_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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