Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9699bab0b46138…

MALICIOUS

PDF

86.9 KB Created: 2021-07-07 16:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b912b2924a8c2bfda111dc24aee386b SHA-1: 4fe0e5a6c34c25d0adbef45721858946685c8112 SHA-256: 2c9699bab0b46138692ef4d9a79c39c76500478a9d13610d66235f2e891d26a3
236 Risk Score

Malware Insights

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

The PDF employs social engineering tactics, specifically a 'password-protected archive handoff' and a 'browser installation lure', to deceive the user into downloading and executing a payload. The document body is heavily obfuscated, but the heuristics indicate a malicious intent, likely to install malware or steal credentials. The presence of numerous links to potentially compromised websites and the ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1ff60uihlgtcf747vkmoqp8438/49967659395.pdf In PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/66185912174.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/88313086980.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec9e46cda---kusikarolizinogunijexenol.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210621_062657.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/nedoxori.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/mubaparejumub.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82d8aa13a---jabelusaroleromo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/6038536904.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/be4dac5aaf9d40d291458d1a93a0af9d/nurigizoxamorizor.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160744a4e15840---fulematibazupo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ebf79f63---gizeminokuluv.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/xutuwaza.pdfIn PDF document text
    • https://invest.pl/userfiles/file/72704299683.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/50859239263.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/28d9d9da9340a3092f79d378fb7b588d/38287656378.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/gutixopomoputowikufe.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/56ecb205baa4ca0c3738b41b93ee2f06/47594655914.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/notupibu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da9a09b39---dudet.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0a717867---tadikuta.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/83050175683.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/d16f5v117b0fki13ocmfoiletk/54828203371.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082607825686---54480206921.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/pizixemapazo.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/nawupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=password+protected+pdf+files+unlockPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 17144 bytes
SHA-256: 86cd3c78586e9a94295de3c61eaf35fda721987346123efefdaf5b4a07f4a3e1
font_02_sfnt_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 10892 bytes
SHA-256: 6b807744433c0755b9aaa5a0e629d3250b1ff177e7d8b4af7fb31f00d8a90a9e

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