Malicious PDF — malware analysis report

Static analysis result for SHA-256 926fd604f6b08c7b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-02 17:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd89df600e9318785945b2641b3ba956 SHA-1: 4bf1d0d06eb3b8a827673a92f102629f26c6c407 SHA-256: 926fd604f6b08c7b29f02aebea5a5da7a342eb33c6f35e9cc96435409f6d1412
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure indicate an attempt to leverage SEO poisoning or phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://bekkercoon.ru/ckfinder/userfiles/files/jupabosevituridawidedov.pdf In PDF document text
    • https://olterus.com/contents//files/92387527702.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/2062574233.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/tugagon.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9fa2e6643d27bb1d8edc7d277d59bed4/jakuteguziwud.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/letegavig.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5tsvsb0oo9hm48tf4eb80obp15/91033845648.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/mobavufesi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/bebemopodofawupedarovaf.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161168a34c1ea5---fumizesukekufapix.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/21256748180.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c44d74fd892ffc82cb0bb6afeead9c9e/63997368593.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/71911828124.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/48997608638.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902082528472031.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161257e770748b---satoba.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc75cc1a4---tifilozebaba.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/tovumumeladorijifosapen.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983ede482be---63044752791.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/61257994506.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/46fa3c5523a49455e5cf08be3a5e22c3/61417170562.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba7fd83f5---tasisuragelelofijasanejog.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/ragipidenakokanozafuj.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/junowele.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf188a8e4---kififi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=steinbeck+the+pearl+pdfPDF link annotation
    • 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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 15728 bytes
SHA-256: 1b09e1106712da5b48f0ce518c29049c57521b3bdbb4a5dabc08d7eff8255878
font_02_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 10736 bytes
SHA-256: 68a2d718c6bfd2a9e98247b9618c7563f8c0505238bd253be8744433c6086254