Malicious PDF — malware analysis report

Static analysis result for SHA-256 deddd5c0755024c5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 05:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6a2f64e71e79e15277dde8353731698 SHA-1: 0695b1c75aeae2ecd20ab85095cf6cb54cf5bb67 SHA-256: deddd5c0755024c593d828594efcdb23da7a806e07e5fb363b16d482d46cea47
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=how+to+get+free+followers+in+instagram+app PDF link annotation
    • http://moscow-vernisage.com/files/files/73156196761.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d744d905e---wojeginozofupopuf.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352255da9ee---75615309917.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/720c084b7419b593ac58ef35cde33610/7358876500.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/zulaveporum.pdfIn PDF document text
    • https://t2sc.me/userfiles/50672056108.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909015634902085.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/jigitixebokelonamakimoxol.pdfIn PDF document text
    • https://loctra.net/userfiles/file/kisabinojagugida.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613948cd14f25---tolubafomilikujalor.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905175345759060asob1rl4asgb.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/92046600606.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/tafipukazisopom.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210908131415.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/1036940124613968fba7796.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/62428430091.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/9554286212.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/95952689308.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/1037249321.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/zonevinebiwuwi.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109020720004877.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/69940706328.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210901155650_722043026.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/sokutotuweguzaselapiro.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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 10776 bytes
SHA-256: 502e81b50c58679727b038877f366c787f77db9112398ab3ee27c098cc42c905
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 16912 bytes
SHA-256: d762cce028ff6992ee72a93204293cba9f79d57a589928fcf81b68fb7c36d2f8

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