Malicious PDF — malware analysis report

Static analysis result for SHA-256 054ff6d98593fd94…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 15:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8f5b37b1a62c2e076f5e96f6fdf42556 SHA-1: 7af3555e79094f83a839d507d554c6d17d12189d SHA-256: 054ff6d98593fd94999726d85d749840a589aa815afca9e8d2f3e021dd32298b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://peoplesmodelinternational.com/ckfinder/userfiles/files/63852741770.pdf In PDF document text
    • http://randoquad72.fr/userfiles/file/xizuvaxutepefo.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/34932639156.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/lusegudotosa.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/gafidobegavi.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/41413899010.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/dadizotafogufuloriga.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/47695371567.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/bipixituvanidet.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/laruruxufugomiribiru.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/59757752659.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b1e3283e2c04060fb58918df01ba94bc/ninokowo.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/33212551102.pdfIn PDF document text
    • http://net-marketing.hu/images/files/56189371148.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/87407984554.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386c0ecd97f---pepepepuxaxabofakum.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/kufewotefelimi.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136febae3c31---gizodunazosunufixisok.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/legezawukulowurumuzobalan.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/wupufa.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/fipidavokam.pdfIn PDF document text
    • https://grouptm2.com/contents/files/63861898516.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/51130639284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=haldusmenetluse+k%C3%A4siraamat+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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 17528 bytes
SHA-256: 7bf4adccd2f03ac2c9296de186a33e51249a36655ac36af1f37b128da5460f05
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 10980 bytes
SHA-256: 706142bf0471424159f2b33d28060c7ce1ab5478421f29c087d934107ddcf357
font_02_sfnt_off00011fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1