Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df749cadfaab4ae…

MALICIOUS

PDF

74.1 KB Created: 2021-09-11 02:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98aa5ae3c0555e4f56624aad33e95141 SHA-1: 9a85c44638a00d4852a9610254c6f2f81c49fd3d SHA-256: 3df749cadfaab4aef37037c188efda6efe81482ada42611e9f9c9a877827737c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These factors, combined with the ML classifier and ClamAV detection, strongly indicate a malicious intent, likely to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mistral-paints.cz/userfiles/files/60205216692.pdf In PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/22874346307.pdfIn PDF document text
    • http://besteva.com/upload/files/6145754453.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/24531636830.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/37435560152.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/60732653702.pdfIn PDF document text
    • https://papiratisk.cz/soubory/ruwunimatagiwima.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/liduzenipubozinowuvul.pdfIn PDF document text
    • http://elpijisystem.com/file/dokuniwuwe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7cfcf31d---32878096892.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/29361818144.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/dixijalonalofeli.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/4375903064.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/xinilopigot.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090710022940.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613478618a6c9---58205894503.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/515ccedb3e3688cbe259fc71cf0d0a23/ruwoseg.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/71297896531.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/26150133775.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/fojoxibolejuwopuda.pdfIn PDF document text
    • https://ekransamara.ru/files/16654939319.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/36340782261.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760c73f616---94287053193.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/gafosulewizuvufujazami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rupaul%27s+drag+race+season+11+episode+3+watch+onlinePDF 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_off0000bb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7B 17012 bytes
SHA-256: 12178745825fc12ace2cbb2c995944cd0b06f402b95122b85dc598bfad31e643
font_01_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 11284 bytes
SHA-256: 02186672149667f6bb313864d11499e4f510e47026ab8d236b60cf1cd2b9ebe7

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