Malicious PDF — malware analysis report

Static analysis result for SHA-256 574f77ce0bbf6dc2…

MALICIOUS

PDF

110.1 KB Created: 2021-09-06 05:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 86d3b51f2023a1bda766e002506acbd5 SHA-1: d724813d6229664e74d07ba6e4e346b7b382af5c SHA-256: 574f77ce0bbf6dc2541d3d27ce9197ced1a32c072dedf48a37ca700543d9034e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn may download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brenno-tojestto.pl/userfiles/file/penaripinabupenu.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955f2754c---wevusanurobekenanef.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/efoi1akqkiphes70bbu0jsqood/52136557878.pdfIn PDF document text
    • https://techlan.pl/files/file/53084381119.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3bfa0294b5b68f0d9721c763dc0b1075/xapasurapegef.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/zibawelimibip.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/44846182833.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/11666454847.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210616014709.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8uhasg6tut7e0heu7ecl4333n5/15686906333.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/31566188441.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/walitegedufadipizano.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/67439349407.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/19129447750.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/fokovopifowelopox.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e9556391906---sugorepisamoseweva.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1hqeoskilq3q3gv2ob0dvcdn06/18537583792.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/79130456762.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/movolajukukimukifudede.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/forapadafetomirodo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab492ad6ed4---waramekad.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/50357107497.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/65289968941.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160efda518a02a---telotoribigogexupinefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=texas+prenuptial+agreement+form+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_off00014805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14805 18852 bytes
SHA-256: 25a56298ea0d887671bbbaf39ed67cc89e8221149a68ccb177a782c9a547f6ba
font_01_sfnt_off00017909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17909 11004 bytes
SHA-256: aacaf5ae8fb705de3d0e9ef717bba247f40a02b2e790c6a0bc68c0e8de6613b6
font_02_sfnt_off0001926d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1926D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1