Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d3e8a4f56668e9…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 22:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 979b280018197e94811e25f06474a51b SHA-1: 1475a276ec02e6a3b0781a1b4617590c80d1b9ab SHA-256: b7d3e8a4f56668e966c3740685973bc9e4657cbc2c0109dda0d2270abeae6146
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are hosted on disposable or compromised hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=lucky+patcher+apk+mod PDF link annotation
    • http://willajarmar.pl/userfiles/file/duzafoxokopon.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/gagaxiwitixomebozeb.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219201748576569.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/lafupowezekumolasesalane.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/jewafowimoluzutuvaxizo.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/81914751984.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/56456095274.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/dimorigurop.pdfIn PDF document text
    • http://chineseclothingonline.net/File/49120344840.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4b22145ad2636ac6903e92bf55017321/sejalatexidokusawoteni.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/3643900614.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/67931910600.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/zaniluzepagu.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/44058397439.pdfIn PDF document text
    • https://mashura.co/userfiles/files/39147390023.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/vawunome.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/149612765fb19e816be84c58aaa70c60/27280623454.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b31b6466b---figilimuku.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9c4v77jsprd3k9l8bh2o6jdt26/vatamomana.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/witebijegajeme.pdfIn PDF document text
    • http://spharma.ua/files/file/bomiwipixikatibadufom.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/julodupewuregif.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a7be2bd9d---ritusenotowowuxupuki.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/16077068262.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/wigakeramuresap.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_off0000b818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB818 17752 bytes
SHA-256: 881fe2104e9f2e10434dd94e4aed4ec972d23cf5ee751149841740fd030a8c4c
font_01_sfnt_off0000e50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50F 10632 bytes
SHA-256: a71b6be855cc0aabb734ab4fc3aa3a4853a09fe7acad0279978b3534a0b7c79c
font_02_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.