Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f899c7dde11f8f6…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 18:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 65b0fcaec1e0a8170d26c4382b063992 SHA-1: 2072aee92a09ccb4870f6ef95d2324728db25d2e SHA-256: 0f899c7dde11f8f60c4e2a54db98573729d682f59fa86b76cd3a75dcec92beee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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
  • 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 http://hotel-ambassador-nice.com/upload/files/mogitogomejuvijaropil.pdf In PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903070458848461lls309srv3l8.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210902195826.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/t4bfogaif2hkk4la2vgb5qrsa1/gotivater.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/61932445366.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/31797988531.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/fodibefasibapajo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081137582858.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/73139622543.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb6fd35bfb---fabakexu.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/48054738100.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/56276013437.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/pupagarelovanilenir.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136da14073b4---biwarolimaxixusasuk.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210907200433.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosik.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/3104498385.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/ruxorosiv.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/35897236519.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tuzejaxasinepafawem.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/15504956451.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jikunagodokiveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=clasificacion+de+los+estados+financieros+pdfPDF link annotation
    • 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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 17912 bytes
SHA-256: 7242ab32cbf983565808c6ad18b1306d00da4da19497e0e206dce5fe9f7034a8
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 10644 bytes
SHA-256: b3f144fde169ec02d14f9b8c1a5b7a1ba55143d282b98a172031de4604617647
font_02_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1