Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb498426bde8736f…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 17:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2415b3d25fa31e43918f130d31b3bb8 SHA-1: 80c24067369082dfb307e674793cf65856c6ef51 SHA-256: cb498426bde8736f0df57d458e027c45f55bd7210b9c39e4e927830ebd31c995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. One URL, https://laborke.ru/uplcv?utm_term=candy+crush+soda+latest+version, appears to be a redirector. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=candy+crush+soda+latest+version PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139adc9a7901---litolirevepagi.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910040410.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/29590341377.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/dexabutugavipan.pdfIn PDF document text
    • http://goldmustang.com/files/files/tabeguxumet.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/34140192950.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/89570026889.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/74709003296.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/15475126440.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/8133482916.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210916053602.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/82990064212.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/93551341175.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/birawekevep.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/30191021607.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/wekiwuganitap.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138090b7b6a5---mubanupegup.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/81810307500.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/35771732720.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/53879533947.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1a87c9cb---76898724547.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/sugolesabukomofakejetalaf.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/60973503383.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/jawakibuneforazosug.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_off0000ca6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6C 17256 bytes
SHA-256: 5d32d6be93254f56aeebf6dda0fa40ba12b63bb9e9ce074614e2a20b90fc813f
font_01_sfnt_off0000f6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F4 10780 bytes
SHA-256: b831c4e24c960c30f9e22b9d7bdc7193fc2bc057b566ee1b074ff20a4274cec7
font_02_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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