Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3836c87d74b9aff…

MALICIOUS

PDF

220.7 KB Created: 2021-08-18 13:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 071177e61776ace29814b89048baebe7 SHA-1: cae089961c399ea89804cfa672c1cb649c241734 SHA-256: a3836c87d74b9aff136aeedee390a15c0e920a61abd80560f8a8f4e0fac4558b
114 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicated maliciousness, supported by heuristics identifying a browser installation lure and links to compromised CMS upload storage. The document likely aims to deceive users into downloading a payload by masquerading as a necessary browser update or plugin. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=county+confidential+informant+list+for+my+city PDF link annotation
    • http://staropolski.net/Upload/file/dudiwefefu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/48481251964.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d1a439a3---53717269547.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e69afa8caf---fonasirepufejonarig.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc665c913f2---34809696418.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/lhmns40tkq5jtkctqrj4q67hs5/dofapedabanusawadokuziw.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/91508501422.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nebijur.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//63044887811.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b046935f73d---jodegomibedilufodafex.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/gaseposebase.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85549686817.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55aab2ff3f---10570951537.pdfIn PDF document text
    • https://carlojans.com/cms/file/lixofajofepasowuzo.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/lewirofojorenegukibe.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/99762095313.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdebcfe2792---joxemesozarimupe.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/33861718505.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/tj6sbmb4kphhjimoqt8s5p17ca/54888471837.pdfIn PDF document text
    • http://altinay-law.com/images/file/16060013206.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a791308e108---burigexajokosevapideza.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1c8ba0e0---zufalidata.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_off00030408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30408 17576 bytes
SHA-256: 3a172d39bf49405381c57d5ef74924afdf0315b51503ae14a45aecdeaaf2fa4e
font_01_sfnt_off00033260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00034a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A77 10884 bytes
SHA-256: 3d9b6a6f6cbd942269995db0561579c7cf347623a528af99fe127bc16e230980