Malicious PDF — malware analysis report

Static analysis result for SHA-256 5847d3843a3299e6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 21:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d0cb4aa85fa689acc8d20e2a75cbae9 SHA-1: 042f39132ed93fa6ef6da4437443e4d9ca980450 SHA-256: 5847d3843a3299e6de51e49a9e4644a0452f3668768b14c1741b5a8f941860a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These links likely serve as a link farm to direct users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=2d+art+mediums PDF link annotation
    • http://shijijiaming.net/filespath/files/20210904132249.pdfIn PDF document text
    • http://czyxchem.com/upload/files/vemimunimab.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c9c4a10ebfd2742ca5225fd9d69f3f91/98959961901.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b508bb2790---siputovawek.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/namigemafowuji.pdfIn PDF document text
    • https://trystsalonri.com/images/file/649547390.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5bfe9a0764c00776742c1ea3dc5b0815/10823647139.pdfIn PDF document text
    • https://allianztc.ro/files/file/43420198878.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/foxozapajitorebasunon.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/15107392876.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/xibukutedipuvojuf.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/kureridel.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/jidef.pdfIn PDF document text
    • https://ksuskalology.com/images/file/buwoke.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7618ed9aa628991ed91f3cfecad8d912/giwakopisebewu.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/vatumivofamumixafono.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021091408373020.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/629654375.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xobuwadunofiwedig.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/27825478816.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/detuxigegugamo.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gusitubavuwanipajojanem.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/98899887588.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/javupotuzorafeve.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447d58d2c53---dulipaganilovikotif.pdfIn PDF document text
    • 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_off0000d503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1A 10264 bytes
SHA-256: 11a1a580826ae96f74b700d2026fbeaa3448bcf993beaa94051338460dc65947
font_02_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 16144 bytes
SHA-256: ff32a17198a7dabc59629b9bc655f89bbd5e62d12ec0edb6e4bbf493c58ab419

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