Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2063b639c558a0…

MALICIOUS

PDF

152.4 KB Created: 2021-07-21 15:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95d6c436ceffb1bdbab2e8c17dec20a2 SHA-1: 8aea7650bd264a5fddcb69d9a6af542f164f8d63 SHA-256: 4d2063b639c558a0700214aff2dca77b260b0a0de9103e753b26c3cd8a7e11a9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. The presence of embedded JavaScript and a ML classifier flagging the PDF as malicious strongly suggests it is designed to deliver a secondary payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely a phishing or trojan download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fkhd.cz/data/img/zurifizalakaz.pdf In PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/98404756272.pdfIn PDF document text
    • http://deauville.ru/files/file/89606243062.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b95b21ad4---xoliwubevufelunuzutenow.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871a346e0db---97445248248.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb2f2d6037---78876970074.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0f4a0f54---36584973243.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/roxutijitirokibapemuta.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/zopaduxikugaz.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c2ace88cef33f1e8a94ddebb446315fb/75584659024.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/vutalelujimenafawaxeke.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/kigixuvafelazuxugiviril.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/gijixa.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/43806268815.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/11581946282.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8d67764a---58298562918.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/vhhqudu5fpvjpvdtfjcmgko3oi/31244220684.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/jexal.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080e72cc4974---vupexususebakajenekevegi.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/pojago.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e6bec54f---gemag.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ojk85rqcnios5cln3vvdpr3d7a/wusutupuvolilas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=shigley%27s+mechanical+engineering+design+9th+edition+solutions+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C839 1840 bytes
SHA-256: 3c500b729e50f70253d5368655faad51b70af7bf9ef4eedb181de45b7688537a
font_01_sfnt_off0001d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D193 20872 bytes
SHA-256: c1aa64fea03c4026fa44eec68ac230c1295c7f27ba2bbcdcd924f7e2823f238b
font_02_sfnt_off00020a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2224A 11308 bytes
SHA-256: 6bf7f97dd03bbf32410e2df75ec61ffa4ff18f4f3b2159a12b1d147a90e11942
font_04_sfnt_off00023c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C8E 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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