Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2484edfc41bc97…

MALICIOUS

PDF

112.0 KB Created: 2021-09-11 14:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da2c61c3247867e1a05c6af5ff4a1e93 SHA-1: ecefd03e9599191c25bd9be94fcf3e281d3ff708 SHA-256: fd2484edfc41bc9738d5e33e4a6a9c6edd4a994548f6130f9dae019c661c64e2
196 Risk Score

Malware Insights

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

The PDF file contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser update or extension, a common social engineering tactic. ClamAV detection further confirms its malicious nature, classifying it as a 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://coretry.ru/uplcv?utm_term=update+to+windows+10+free PDF link annotation
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/23173984988.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/33330333402.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zadefakesixavarap.pdfIn PDF document text
    • http://rts-3.ru/upload/files/48565346188.pdfIn PDF document text
    • https://soechi.id/userfiles/file/68643781333.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cef5aa576---74672892150.pdfIn PDF document text
    • http://mc-opony.pl/files/file/71204332379.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c8219a567---deloraropaxeninijag.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/47676745626.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a9bc6d5b1d3d47fe2d4d7c3d1f62ed53/35417581331.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/tosedemuzeta.pdfIn PDF document text
    • http://soles2walk.com/data/file/59533395269.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/jijuzijebajakorozafe.pdfIn PDF document text
    • https://blokhol.com/upload/files/tepotebidimedavalulibara.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/gilusovufunudeduworul.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/94831a8db461ecd8af37d25731cb4e3b/18117039631.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/rekepariguxobivegoxivu.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/rijigaselovenenumo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xafevupewazufu.pdfIn PDF document text
    • http://scantech3d.com/files/zobepidegudetudado.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/bavixovinuxigup.pdfIn PDF document text
    • http://drironcat.com/images/file/filasumedudezexiwob.pdfIn PDF document text
    • http://clingac.com/d/files/8267259984.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134167e98f04---99878089970.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/kaligilib.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_off000152a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A5 10712 bytes
SHA-256: 7188d64841377e48a6742170b72d97e5235a705ab4a4d0e0887662cec5bb9b0a
font_01_sfnt_off00016b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001838f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1838F 18000 bytes
SHA-256: 3e240027bf462f3e6a9b3777c330168fc48cfccc4a5ec25c1594b0fc64dc40a5

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