Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fc9e602efdae7d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 05:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f71189899bb0d544d5d1a4fb403fa7b SHA-1: 21431ba97fa05349e1a6ef9099756e71103e4661 SHA-256: 98fc9e602efdae7de9f1c69bd8c3970566bf324cefb5612089cbf652584b2193
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, with many pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://metalzilembo.it/userfiles/files/sopowuxu.pdf In PDF document text
    • http://anatolianlgs.com/userfiles/file/3380049535.pdfIn PDF document text
    • http://agavietnam.com/img/files/kixulolebuposok.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/teparemozilefeli.pdfIn PDF document text
    • http://htwy.com/upload/file/bumekivipivebuxed.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/safowaboluxurotukeja.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/91370311624.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c245e25b108---juvikorixiru.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/5bcb3a83a59b3e52485b4e794d787415/43226309564.pdfIn PDF document text
    • http://funperm.ru/content/file/4957401686.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/84499392440.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0fc79b61---84661233359.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/nulozupoverunovemofonig.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/58691775016.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/betuk.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/43684942625.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/zebidugo.pdfIn PDF document text
    • http://annabarons.lv/files/files/kolamumakorejufisepeb.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8854bb66---12212187898.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/7761050329.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/64254075637.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/cfb2251564d7c22f29d6650bc465f6dd/53287983759.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/bitazevutelujivumipemigu.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/04/94071860890.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bobojalopepebonagavevujej.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16120aee208e8b---45871792949.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/29541905202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=instructional+communication+technology+pdfPDF 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_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 11232 bytes
SHA-256: bce71fbceb65628db77cb8bca35b076094894d0033e100cb261fef5801859214
font_01_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 17988 bytes
SHA-256: 71a836b4d74596fdeca0ef5ba2deec230378cc550850a6cc890e3c3c013055da