Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb61f80bd05247af…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 15:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9cda4bbf25c12997038f4201cdde921b SHA-1: 08aad7281498aaa9c07a1910d53874d473e9318e SHA-256: cb61f80bd05247af8357df0019fb7c94e81962633f58ffe903d191704ea9017a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains an embedded JavaScript stream and numerous URLs that form a link farm. Several of these URLs point to compromised CMS uploads or disposable hosting, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://casms.org/atts/news-files/file/56216558672.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161358b6003281---78526597926.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/89306341912.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/58906610924.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/71226657993.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/zeraxorufefunixude.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/dorajefivovimovopik.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/65574492793.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49399c744---nevika.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/72162174363.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/40365746837.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/nifopo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9010dcfde68643a638d1deb9e9e4a40e/52171690726.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/kajatotinorido.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/15777035121.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161432f43c8022---nojilusoviboxewadorov.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/31497130806.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/62335221327.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/83320446616.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/6293066410.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/98742959907.pdfIn PDF document text
    • http://word.mn/uploads/assets/30569289336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pixel+4d+live+wallpaperPDF 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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 10228 bytes
SHA-256: d0a3945f378130fb90142c40cf00387be53da69a0c2b8a7948c9ae114cb2e1ab
font_01_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 20160 bytes
SHA-256: 23f3b900eac0ea6e0e76d3f7f226edd95e6651f3d03dd0575d9dc9a1dde3d049
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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