Malicious PDF — malware analysis report

Static analysis result for SHA-256 457f309164b721e9…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 01:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e9335e97e5a34394935a6c46d9a901f SHA-1: 5a265f4357cc16e4df4df24f02d935498967f048 SHA-256: 457f309164b721e9f6c7d66fdb047b9af9ceef494d35cd8dd9d931761d4d533a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6692e7ff317c0336b8574efd732d0f73/rapugekafowifokozara.pdf In PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210706_972D86C256D3513D.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b804eea07c7---79676438532.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b24bc1b944a---rovebibozomavalalad.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/882c54bbe45c4c68c21f14e3dfaae958/difozumize.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fdaac4e11b044003fb4814d81861f42e/92333932837.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/90654661957.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/wavijo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f3l3lv0kecls7m2o5jj2hmsrtf/24152987012.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/pibavupusepujexesugu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/7911211431.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6f64fb60ee28fea49cca0ab44d05d356/bazupeguwizedelaxase.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/pipomojepumaxela.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/29/junelirokikiwugagunolef.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021051910203124.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528220656.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/49004229929.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/57422851347.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b225a10bf9---51857317885.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3478a1d78---vavixowikenarobako.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/lokoj.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/fufekope.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/mupanexog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=e%C4%9Fitim+bir+sen+aday+%C3%B6%C4%9Fretmen+kitab%C4%B1+pdf+indirPDF 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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 11316 bytes
SHA-256: 71e03028cafa2e16f3107d1fcc1efae705479224618af7a0e397bc15322b7d5b
font_01_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 19196 bytes
SHA-256: 8ed4b262d26682ede8bfae702b4d7e895f52abf7066ed3bbd0a8f239d9813a69