Malicious PDF — malware analysis report

Static analysis result for SHA-256 5001a911962cce9c…

MALICIOUS

PDF

93.4 KB Created: 2021-09-16 17:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef4d2b843dd20ec666b2f89628ba0647 SHA-1: ae797f6cd1fd4cda9a6620d3ffb520f50c7f75e5 SHA-256: 5001a911962cce9c966e35397907ee66bc9954bd1241a0a0256c2e4d234f3551
204 Risk Score

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update, a common tactic for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • 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://coretry.ru/uplcv?utm_term=amazon+prime+apk+old+version PDF link annotation
    • https://kingyao.com/uploadfiles/files/20210913_180736_3290.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dhr7sheojpabh3ki88qln36sh9/gepilamanofegat.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377e46d79b7---fopamebokipuxifu.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/xanodejonuziso.pdfIn PDF document text
    • http://ranch.pl/files/file/68194664996.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/mewinatanogidamekedij.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/fikesa.pdfIn PDF document text
    • http://kite-surf.sk/files/monejulopetezirile.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ec383f79---45147741733.pdfIn PDF document text
    • http://immopolignano.lu/images/35057876975.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/busebevuto.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/fepakavafonate.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/bugitax.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f44b5e42c6---36134790638.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/6076589613.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/zajifokezorefeg.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/juwibigosidida.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/karekamumalunu.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/dovegojidepitezalo.pdfIn PDF document text
    • http://sb-78.ru/files/file/tojajuwiwikem.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/12345460271.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3465365440.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/sojosazulixilam.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a245265f3---41200750736.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/mawujemexenumiliro.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_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 10652 bytes
SHA-256: 03daff4549818e2f64bacbf12f537161fd91eefedf4c44920524e3f6db25fcad
font_02_sfnt_off000137b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B0 18524 bytes
SHA-256: e34d86f7d8fcfe3988a0969cc47c85f74825e05632d566dfb9d576bfcbd42439

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