Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5580fea4e3541c0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 22:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bc5560889a2419f162ba1881c986ce1 SHA-1: 99e4c7ff6d680b72267c55693db1acc32fe69013 SHA-256: a5580fea4e3541c0ddeea895a773b460ee481acaa8ebf5bd4fbe92d30816dc4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://catamma.ru/uplcv?utm_term=meaning+of+workbook+and+worksheet PDF link annotation
    • https://jackyrouxmethode.com/userfiles/file/23409555073.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/11144641609.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/losejaxobenoruruxifukake.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lubupafazubepamoj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/5ddb903ffa4b1b2f50a83c3070607f54/51513993915.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fee5a42418---93719831486.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/dd177ae5ca21b293f84ff5c044924afe/56059651164.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/91734259242.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fce36e224015af10ea8ab7b19efd71c5/50420684954.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/90280418636.pdfIn PDF document text
    • http://unseretochter.com/images/file/76895744424.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/94572909992.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/wanesaruwebowam.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/gemode.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/12947608934.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/88035500081.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b812238d6---84130625215.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jgvt341nvja7ekmgq7lbe5pp81/mekewuponogafowew.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021081900055073499.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abb2891b2f7---83776008240.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8733911a---74212426332.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f2a15ac3bf6ed780b98610d82e031ae/borupinofew.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_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 17452 bytes
SHA-256: 6b3b27a6296bdc291f0068b52941884b0a07438aaec532a981622c5d330706c9
font_01_sfnt_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 10900 bytes
SHA-256: 81c95d67e48c9e67ae951f70075802f82f48050b4168f3cf3defc45f4f536d07
font_02_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.