Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddfdf3622f6be64…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 23:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 968c5a67403be9fb74fe3c853bcf6d88 SHA-1: da4ce23d3ca7707219328722bd85d6541349ebb0 SHA-256: 5ddfdf3622f6be64691a6d1dbd7617420c3d2273554c4d9be0146712c76aaf2e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous links to external URLs. Several heuristics indicate that these links are part of a link farm hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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 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.
  • 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://irlanc.ru/uplcv?utm_term=undocumented+aviva+chomsky+pdf PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e1302a597f08a50a52692eb91b45075f/zuxekuwepov.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/74699904942.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/77770042639.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902083749_98jj92.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8ecb1545---34149861753.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/5696963446.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/eitnh2pv6dpkcgvu2vt2r6j7vl/mujizugasiz.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/814dj4dnsfae2qcpp0lucfdgj3/91555126557.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c3d4e2cb---62583975617.pdfIn PDF document text
    • http://congnghiepxd204.vn/upload/files/sawitalezuk.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/wekezuwomat.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/futetesud.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/61202894861.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/dawolokibifutelakex.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/54167056019.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613819196d074---nakoxovuraxewali.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/42259625329.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zubugabipusasigenominot.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/misimofuvolitozuwalazowas.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/lugexan.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/36095616031.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_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 11120 bytes
SHA-256: f2ff2a35fa6c94b56dccfb5a826edf54a7fb6be667b6933a299c0a8c9b8a94a4
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 18052 bytes
SHA-256: 010399c738c642b09750187ed4af630fb65f848e96d95cc8c6a8a452a12497ca

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