Malicious PDF — malware analysis report

Static analysis result for SHA-256 b888c515e5a7bf92…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 01:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 963a4541c1e632f9b5f273e4d876967c SHA-1: 202a2bf6ea57d00eb4d8c52ca4b6144176de1dcf SHA-256: b888c515e5a7bf92a3bd836f8651806b8f48977843939352abadcd21c4e45c4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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/GLLx1DTH0VQ/uplcv?utm_term=angels+in+america+pdf+playPDF 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_off0000c22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22B 17084 bytes
SHA-256: 1e5bb3467793d2e7f1e289adfeff7dc399c7d9f2f65d76269960f8b1e17bd6a0
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 10840 bytes
SHA-256: d19cac92b522bf50817c9142f443f37ead02862464bdf79ca31af0eebc18af9a
font_02_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1