Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7684539bcd9e66…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 15:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de4834c2286d5181b7d4c7fa8fa26929 SHA-1: 9d84c2ee173309bf7955969a965756ddd3fca912 SHA-256: ee7684539bcd9e66e0991ea12b1780c1952f1cd34a2652add6139f723e57b77b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://szwygs.com/upload/lexasikapibakolulufabi.pdf In PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/66235379768.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/fevumoluvunuzenimoworal.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/banolikabopusuvevobudorix.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/75262773322.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/88898243379.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7fd31abb4---27404249452.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384fb276864---repaxelaxasibebidakudobom.pdfIn PDF document text
    • http://hkwwta.org/userfiles/10457811367.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/futorizafugega.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xetakiparejixenoj.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/32869870257.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/xurajat.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/lonir.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/sorusutegebagevozuk.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/ruvavufizis.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/35435988558.pdfIn PDF document text
    • http://futboltotal.net/images/files/fevazasujiluseda.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/68594065231.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/50940517359.pdfIn PDF document text
    • http://rc-modeller.se/images/file///62236748544.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/kugubunekizadup.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/zofol.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/30789071268.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0594dbd9a1ce9c3b7b77f94792098cce/9724468416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wingo+colour+game+apkPDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 18104 bytes
SHA-256: ae9cfdcedb30694031d98ae0add00d58cbf203ae156e1ec6711fb388f015d29c
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 10636 bytes
SHA-256: 9de436932976c6d6d0c07184a18ecfe444b3d42c636bd87735ec3443986cb417

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