Malicious PDF — malware analysis report

Static analysis result for SHA-256 98847f6c97fc96f3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 08:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3be98dd039d3600b69b409dbdda5e2eb SHA-1: e84d2707d73aae5b9dd883e6236fc6f8014361dd SHA-256: 98847f6c97fc96f37d31963a3cc5d220c39ea283573b8480e075711a38b56de9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b2e179f1---sobizusexobapamo.pdf In PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/laramitutitukuzituxi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc295ef66---ninetewoxebunu.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/midonirevide.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/18989934406.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9e4726b620ada14158040cff469ec8e1/54387720555.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/wafexuwuvunoguru.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bf166699c57ca7de23603a5addc78a78/tubexoribuxape.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/1mqpln53gj9ifq8h7iki3lpjui/juwijas.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/39c5154377e46c6a9341686c2347c7ea/zibivivojug.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/dexifigomuxuvuluzepo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b043c4d16---27197774416.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611714128d27d---boropapum.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/jvg5a3lr4qmsleo6mqi6sgtsdt/tetisaxuxigexogapuf.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/96840528194.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/97470147626.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/wepupukomonasud.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/mubewikenisolatunij.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/4d99acf84c8ab8bf7632cc2c96897de5/mufizorekaseka.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/90931441363.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/80973819430.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/saxikagetulaxumoli.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nedofovojiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chills+during+the+day+and+night+sweatsPDF 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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 17180 bytes
SHA-256: 3b2acafca6f122b09f801a994b211ebf40519153d64e7356e4f7745abffe830d
font_01_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 10736 bytes
SHA-256: 8383cc5ef39f73f0f48fa4a8ee5230aa52fa0965c312aae7290f8a1981f1e77d
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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