Malicious PDF — malware analysis report

Static analysis result for SHA-256 8234cd8d5219f91d…

MALICIOUS

PDF

75.9 KB Created: 2021-09-11 13:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9c3ed9900f250764eb2edc7d8822ab3 SHA-1: d1ca980be00c8698ae5b8341a55867217c34e9ed SHA-256: 8234cd8d5219f91da7fa61fc8457dca1b826cb4b6440ce620f4f7ff290653861
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Web Session Cookie T1056.001 Input Capture: Keylogging T1071.001 Web Protocols

This PDF file is identified as a phishing lure, likely designed to harvest credentials for services such as Hotmail. The document contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing kit infrastructure. The presence of a 'SE_MFA_LURE' heuristic further supports the credential harvesting intent, indicating the document may attempt to capture one-time codes or MFA confirmations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=hotmail+co+uk+sign+in PDF link annotation
    • http://changwontour.kr/FileData/ckfinder/files/20210907_255A2ABB85F12BD7.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139346db822c---bidugufuposovu.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/wedozutozesalevo.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109020913581825.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/gudigoxu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d2956b1ed09fa02848401164e3c6d4e5/bagagitowilotemawazuwapa.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/wiwesopozoguma.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/89911754590.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/sanek.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/74450194732.pdfIn PDF document text
    • https://andana.us/files/files/paxej.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/6219058151.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/86238473749.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/dosujupebewusafejod.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354054fac4---9460691298.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/maxoxalo.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210910001818.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/79852745369.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/satifefawubotak.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161341dc88f4e0---wowiruxuburadopumuteniso.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/89114690258.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/18193066720.pdfIn PDF document text
    • https://agrando.cz/files/file/tawexo.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_off0000c5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BF 17172 bytes
SHA-256: 6b505ecfcf81f228e6a6ff8b8048c14ce1822ae98e8cfb2cee96a5709787458b
font_01_sfnt_off0000f1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B4 10524 bytes
SHA-256: 97dbfb5cb52db794b273d51cec2b3cd8475b31ffaa4c1322e2b43915102586fe
font_02_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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