Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c4dc2f5b7bc936…

MALICIOUS

PDF

64.0 KB Created: 2021-09-10 18:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0c033e85dc7e9284634a02c68fe1102 SHA-1: a5a7017ef0760f60fa1c36c956d43b3cdcf60560 SHA-256: c0c4dc2f5b7bc936efb8734a0d9b0ebf6de5b50b6e956ed77d506abfc2955e0d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nomylo.ru/uplcv?utm_term=app+mod+among+us PDF link annotation
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdd5b4df6---koxufibunenevegowogotenu.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/wivudilujaparawuwofe.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/38527182796.pdfIn PDF document text
    • https://mavibusiness.it/file/20646074197.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/231986d35aa1367e3c5b472fa09796d3/48277733828.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/68305585955.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/sawegonaxedaxizolefojova.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210901080829-senunarexu.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/xosisobubaxovumidejawe.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319dd15992e---90720227205.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210905084405.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/22991514597.pdfIn PDF document text
    • https://kapefashion.com/files/files/dixalatefupezinakejosanav.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/72394829129.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/lalivere.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/nejugelabubed.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/1608135646.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/79964294951.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/79748682222.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/38843091432.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/15557412480.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/88946545427.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/gunefanis.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 10348 bytes
SHA-256: e9877023e8b9e5eade805f7302a1c737a5cb89257455be514dc74a813ab49451

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