Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0776ca50a42f0b…

MALICIOUS

PDF

89.5 KB Created: 2021-08-09 05:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6e577eb15c58d8ccec43bb8393a010c8 SHA-1: 98d6a4a09b483f3d5011160a0cace95c44626f8c SHA-256: ef0776ca50a42f0baf1b15ab03200d6608a372e5fd9718102e27f681c2281946
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document's content, though heavily obfuscated in the provided excerpt, is indicated by the 'SE_SECRET_RECOVERY_LURE' heuristic to request sensitive recovery information. Numerous URLs are embedded, many pointing to compromised WordPress sites, suggesting a phishing campaign aimed at harvesting credentials or other sensitive data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://medvor.ru/uplcv?utm_term=windows+10+pro+activation+key+generator+reddit PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2ccd02caaa1997eefaad927e11216322/mepekaluripusut.pdfIn PDF document text
    • http://debden.org/userfiles/file/1959539854.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/merajubemajafaluremaxisa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/htqdjf2f40g8bkh7m23b2jjm64/17955334688.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/41524787143.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c05c4027b---pabunogexujimekefo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be168988edc---90776801542.pdfIn PDF document text
    • https://paradigma.bg/uf/file/dawegirugoladudimef.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/72439332412.pdfIn PDF document text
    • http://parentini.it/userfiles/files/goriko.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/polobasefivefi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/43774f217988c531b23c1f470d1b8ff2/3878371433.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3342c322d21323d0e392dcee48db9867/vedovawoxalosidodug.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/42bc80d3a34a938c93a8f2da4bfaadd1/wawikusabugerevowuvasufet.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093449142d84---kukosisunota.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6248a6d0e6b1c16657bc7e3351728921/doxaverafawafuwoluwowoda.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/bagazininixorosedojod.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/91935701309.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/dokuxunota.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/natewo.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/monudatidunopudumavavusa.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210708_37A543A66A66EB68.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f984320dbb---rekenufed.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/ruromanajumezo.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/gonenozos.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 11168 bytes
SHA-256: 7cfb4f71e891acee1a6309fc8c673d031bf39fbf761d2ceb18f3a03f0cbc076b
font_02_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 18152 bytes
SHA-256: 3fd5a7f7f29bcf4a6b0525592a31837adf1eb4308a37c6b3dbd70e15a60ff460

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