Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b1ac6b6a1ad6f5…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 10:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50aa698cc83387d6c56db8a1e2eaa7ed SHA-1: 64f3d705a2824c3d0c856765d867c0f2e729263f SHA-256: d4b1ac6b6a1ad6f5b84f8083945f06d770fa9ced7e2e4d66598c0ad2e2bf9232
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple PDF link farm heuristics further reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://wonwon.taipei/photo/file/93080120963.pdf
    • http://taiwanquinoafamily.com/shopadmin/upload/files/91984540646.pdf
    • http://viquadro.com/userfiles/files/74734827405.pdf
    • http://tsg-edinstvo.ru/userfiles/file/59490443977.pdf
    • http://thietkewebsite.btccorp.vn/uploads/files/likepaxuza.pdf
    • http://brenno-tojestto.pl/userfiles/file/jajuso.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16147c2c5432ca---48408236367.pdf
    • http://tele-klass.ru/i/upload/files/mejil.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335dcc80892---pepinasal.pdf
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/26094510994.pdf
    • http://orderbestwings.com/uploads/files/fipukivud.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8899c8908---kukofajukererifudariwezik.pdf
    • http://easyhypermarket.com/userfiles/file/tisemopazebokumabu.pdf
    • https://lmbri.com/WYSIWYGImage/file/juvavireworisatigi.pdf
    • https://actorconseil.com/files/file/14032237359.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/newasuwokipaka.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/22465808122.pdf
    • https://nbretail.com.vn/ckfinder/userfiles/files/tejamar.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/59m28e94c3ba2nr5pvos15usv0/35171771495.pdf
    • http://zhouzhuanx.com/v15/Upload/file/20219141310326535.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2t008o5p57u7ehsi5pp55eq7th/jetino.pdf
    • https://ever-progress.com/upload/files/62758862650.pdf
    • https://arvikabc.com/images/uploadedimages/file/88555550081.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=doodle+god+blitz+walkthrough
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aecc.bin
2e760daf65a0ab44c36a5bebbe7ef2f34fe47e51249483e55893d925f404afa9
pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 14404 bytes
font_01_sfnt_off0000d30b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 16792 bytes
font_02_sfnt_off0000eb22.bin
8a40822db05c0e8882f809cd18b41eab023bae2f597991d4a33dc440353b2576
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 10736 bytes