Malicious PDF — malware analysis report

Static analysis result for SHA-256 920cf4b4cd6a6d3c…

MALICIOUS

PDF

73.1 KB Created: 2021-09-15 06:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2170a32602a4c29e8d76dd3d167593f9 SHA-1: b86a7df9f229faa2a6ce2d84a85872bcf0acf31e SHA-256: 920cf4b4cd6a6d3c8e6bd7a6c2bd48ef8b9ffc6aad0710261448fa35b8937582
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=a+quiet+place+part+2+english+subtitle PDF link annotation
    • http://adimhukuk.com/resimler/files/48200367577.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/7512320031.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/98739886094.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/leumd9v65jokogvq453kt2m8j5/27453542542.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/1f69gl78hmodtmnf3ptb0bilsh/96578177770.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/79044089712.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/25275481951.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/52d4e85a5c4fb37c24246180ea7b4861/vevole.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/fivuwizenunidel.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pjpteapd5p5v5p797th5np9kvd/795015509.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/49513945113.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/70535531115.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/wefutefurad.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/fuxisivurakoz.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/gafitafajenugodulal.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/75381045791.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/zirojonu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db97501865---73951217579.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/87150369209.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/79385180738.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/19609675090.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/75031758423.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_off0000baa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA4 11020 bytes
SHA-256: 987f801ce3a833dfda2e1224acf7e7ce9caade9a35531897c119936dc36df0e3
font_01_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 16836 bytes
SHA-256: ac4dcf35415873caa6b706ffd39f4aa79b291ced0c5eb42c58a2e6e2ccb1d3ff
font_02_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1