Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fce272fcf3c3866…

MALICIOUS

PDF

76.5 KB Created: 2021-09-03 07:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b4e654ae48439ecd66d7369d37e792a SHA-1: 282de7f94b88ef7c9b3b90e2eb0986944f5bac76 SHA-256: 3fce272fcf3c3866809b8d760886ddf65bafb2632ab502e842be7d08ea60bf4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads, increasing the likelihood of a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://konteshamamotu.com/userfiles/file/87042135442.pdf In PDF document text
    • https://confetti-seasons.ru/upload/files/49193187840.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb04b28419---17272064187.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/10430635423.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd8482b87f1---92485530637.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/16775014734.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa071ee10---63249591888.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c19c32b3a---pefezeriduletanuzajig.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/46558479760.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3041ee96---watuvesowuzolamekeximo.pdfIn PDF document text
    • http://hms31.ru/img/file/48734558133.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1cd82b318b19dcb404ebf1b82a874712/17266602143.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210628_3A0EEC207D134A6F.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/xerivovezuvudimufonogadod.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210825162988988618.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/vorosidopasopofo.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/sofekozitudofusam.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/kavekapep.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/6262939223.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/telidoxezukazadoj.pdfIn PDF document text
    • http://newo.ru/files/files/94357442474.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f686249197d59815f1727e74dd1b7821/90519577493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=manuale+d%27amore+2+full+movie+sub+indoPDF 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_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 17272 bytes
SHA-256: 75878e681679c0bd8213eff05eedd1db191e74af3a13370cbc54abb31bf92996
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 10868 bytes
SHA-256: 9cdb78579d06f9e3009a2e1c52913cc3665ba8c8ee0972000ad72ea1d85d56d6

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