Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e0c57dc24c2962…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 07:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b4e2fa36266e5123d1fc6b613df1ddb SHA-1: 7de2fd7890d0aac53f0bf297ae308df0251b680a SHA-256: 76e0c57dc24c29627016c031a72a2882e57d9da593e8b72e6aecdeb713512802
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/268411961.pdf In PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/98673161292.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0eaa0bda---96050536807.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075620751663---tuwoxizirasupibif.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bae5568a2e2---rudesomotupipe.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/34601617551.pdfIn PDF document text
    • http://abpaluso.com/upload/file/92377046558.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bb4c6d81---86721948743.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/94748209218.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/76045886700.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8d5b9e1ba84ea954aa28a5dc5dcff514/82771700465.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/62104011258.pdfIn PDF document text
    • https://rippa.pt/files/file/10948662521.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/42339411417.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/pefetasuromonipof.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec05e1e51---86927434781.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/saroxek.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/vozijuxogefoxiv.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/pabivesujugadujunapukew.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/98633161547.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609073145aacb---jigumobatuzejodavexij.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1cdc87d25f34ef2b9af7f38139853ce5/maxinufu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945840c8576---23848015449.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bikawopa.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c4db086ad1510a125f2af5affd92a7f7/10236490282.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9173524dfec80515a129e7a1a5c7da4b/bokiwebikaduwavuwufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=manual+jeep+wrangler+for+sale+perthPDF 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_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 10856 bytes
SHA-256: 33f12c97985bf7d3b42da99b56c2f8fb7262e65760ae23208d4750a6fc782600
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 16916 bytes
SHA-256: a91d23140a9f9af2a75d4cad36eed4d647d5917ff6ba928a8ca6db424d9f1624
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1