Malicious PDF — malware analysis report

Static analysis result for SHA-256 255646a4d6cbd233…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 00:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 466e5f00659865b68ba88b07a678ede5 SHA-1: 5e712b4bec83bdcff75f5d9acb0c4a826815930b SHA-256: 255646a4d6cbd233f05c6b89dc775a55858778a38b950c1ed3a1597231c12b97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://wastran.ru/uplcv?utm_term=karate+fighting+mod+apk PDF link annotation
    • http://fine-trading-knotwork.com/uploads/media/32619384465.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/79394404645.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/41325002404.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iuc1pskbnpp5igdmf9l8id3m5o/kawixukaxerovoreruvare.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/89975855074.pdfIn PDF document text
    • https://foulardfotografando.it/file/94165642400.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bisowizosimigudifemi.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/55155312825.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/9607223817.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/xavukapesoravarabobokup.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/88287886865.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/39431271942.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_FA70742D322DC358.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/82503a1c11913e21eb40da5eac62d40f/jubazesonuleximor.pdfIn PDF document text
    • http://teraval.cz/res/file/nenikip.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/8690c9d751c4ef4b8521dafcac912b13/91386620557.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/3f815f9de594977e8ff33f76c9edeba7/18841381664.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/sunuruxoxagevagusokemopof.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161384a42b2672---fokufidurasikuguteke.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/firoxupiwur.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f8a63f14d12fb67f4d8bc8d033032c7e/vidotikejofigiraded.pdfIn PDF document text
    • https://12shio3.com/contents/files/robaxotobosamomoteperiwof.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_off0000bed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED8 10812 bytes
SHA-256: 1434345b15c4c00bd40368b5375cef604f5d4b5c23e2581bacf6201b123a2af2
font_01_sfnt_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 17644 bytes
SHA-256: b19b0437a361bac95d91651624e2cfaeb107ff8bbdd64a23b7e36d972cf40257
font_02_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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