Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b16015af9531014…

MALICIOUS

PDF

77.8 KB Created: 2021-09-11 23:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d2f6d934a0bf4d08ffd2085a96e96857 SHA-1: 6b02dd2966d9da61f1205757f01eedc307a9ef17 SHA-256: 0b16015af9531014714bb6a9814d15f6fa25fcb250f9ca40dbaaf10bab267fa7
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating potential for malicious code execution. The document also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute further malware or conduct phishing. The presence of embedded JavaScript and external links points towards an exploitation attempt to execute code and redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • 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://pannonfinanz.eu/editor_up/kixewopejim.pdf In PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/zafovipokowedam.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/87704295227.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/zixofepufuk.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/xominosobagedesakapamo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-3/20210903195804402420.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/57542128938.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/mavapig.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/61pkpjnbjink9q82c7dia4ss7q/lavukupasutokejat.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/wusonoregeminisudugigewa.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/semotejirovipus.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/95577882557.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/31005665355.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131263ac1a35---43020321244.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210907_22e75.pdfIn PDF document text
    • https://avenue102.com/uploads/file/81903654099.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/jenikojoxugivasovuduxele.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/lofalarogeta.pdfIn PDF document text
    • http://edallyshop.com/upload/files/nefaf.pdfIn PDF document text
    • https://pellevah.com/upload/files/52667344397.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/rofewofu.pdfIn PDF document text
    • https://btegypt.com/file/faruri.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/43491755610.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ror7dke6l493rksm4rv6rvg6m5/vomixozetenibowaxafela.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/pesofojolivimisup.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/91791604748.pdfIn PDF document text
    • http://epicridesnepal.com/files/gowikupalovusawaduzifapax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+bowmaster+cheatPDF 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_off0000c9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FA 10768 bytes
SHA-256: 53a89620d45243443f945f22b42c79f22a932224333e4b57d670ae14587bd96a
font_01_sfnt_off0000e2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABC 18116 bytes
SHA-256: 8428f33bc24467421ed295ad8df9bdda7461c8a77a29c46443caf98ae48bca66

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