Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99426e887d66b92…

MALICIOUS

PDF

91.6 KB Created: 2021-09-01 21:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c925d5bb4839ba3b9f85f3be83e4860d SHA-1: 6730a2f7b9619ed68dfc80e84d8e46a823ecf50d SHA-256: e99426e887d66b92cf7db9dd4acb1fae9d08c960b2bbdbe1f983486b2f2d43dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://csp-pub.com/stockages/files/91728632372.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cef2527d73726d027443ee3a76b7aaaf/49803090517.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/99331580909.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210529_6BC855D9A79E7D5E.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062610244273499.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/eb3dcf3c84410b52f0ccbee164bef904/xivifimogulaseberebij.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3c5d3649a9d0b7016119110b82f7bf1a/jisijanuvelatiruzefo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c2a9d4e21---nogubuxo.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/sopazikos.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e9c0a8dc---60636245912.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b45b634820d67dbc7ab674d34ba18766/dogafozejuz.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/55390038653.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/6d2dgeb4jje5pb9m2hm9n0norb/39090447308.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/dac8dbce6127af3eed674a0275066bcd/ratanagidazajoxufawopa.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/xiriwuw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5584bafc---jazonoteleveketugidaxobo.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/bb35d322fdc0a553217102b5e33a0ea3/pipoxaji.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/9806307915.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/be68f01747ecf94ffd1f5d3e8f860301/24095734377.pdfIn PDF document text
    • https://mihalex.by/files/files/govakamadafadag.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/wibujoleramo.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/94469650575.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3bc7f781---65866959550.pdfIn PDF document text
    • http://naucseto.cz/storage/fizemiroxevologis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wayne+rooney+and+wifePDF 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_off0000fab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB6 20808 bytes
SHA-256: 8f8ee636c434db01e3983bea153c3292584431b580f58e8f8991e073c07150f3
font_01_sfnt_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 10228 bytes
SHA-256: c5eb503adaceab2c488f67e1a57f18e15440cb3806d89d44b0df89d20cb3906f
font_02_sfnt_off00014859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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