Malicious PDF — malware analysis report

Static analysis result for SHA-256 6440bc4bede3c336…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 01:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f205a3dd3b31ed1171ec0b03f66a758e SHA-1: 0ad89a2592005a737120249e1b77eaf9137aaba6 SHA-256: 6440bc4bede3c336a86a9797f6c6ae6d49c887650a1bba72ecccdb5569f16708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://theseadiaries.com/ckfinder/userfiles/files/59165394008.pdf In PDF document text
    • https://stoneappeal.in/FCKeditor/file/65421527224.pdfIn PDF document text
    • https://fond.ru/userfiles/file/41598671084.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/39965103385.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/kesukoguzizefuwike.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/67560943140.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2b5e98062---18586655387.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/dumibafejutova.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109090609562548.pdfIn PDF document text
    • http://anninh247.info/upload/files/54348746287.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/8148880448.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/38582829396.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9bd32f8e5142252de04b04169d521922/juvetutakog.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gividejarewaporivi.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/53894408132.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/53427646707.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/19746567062.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/xitineveperi.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/finumaki.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/93ddc9c38273b324dddce03e37fd0fa9/zulekefak.pdfIn PDF document text
    • https://congchung7.com/upload/file/subisogerigowipubojijogu.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/xekopetefigezawutevel.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/sinofedijogipat.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/95187902468.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/tagafetamalalekusuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+amazing+spider+man+mod+apk+downloadPDF 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_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 17248 bytes
SHA-256: 2d675bb6d2091ad15c2907a1f05faaef51b5def77be9ef8c5d8a8fa44b2ebbd2
font_01_sfnt_off00010838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 10940 bytes
SHA-256: 090e9121b2eab93d3024e90a5d0219be00d6b52ac8ca3b015d503faeb9a00e43
font_02_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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