Malicious PDF — malware analysis report

Static analysis result for SHA-256 589419624e4b9f2b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 17:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42437968d5f93f50819b5021fdf47daa SHA-1: fc88c89ef712d69dff281c0de83e326304bef69f SHA-256: 589419624e4b9f2b89830b671fcf79a00fcdc014888c3e1e4fa213088a1cd765
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the conclusion that this document serves as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://phatgiaolongan.com/upload/ckupload/files/41702236003.pdf In PDF document text
    • http://highlevel.pl/userfiles/file/kagawigakewedalap.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131818a913d5---togotebafigitofonesisivo.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zerugeboxa.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/jadirelulezivulorawiri.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/46825950901.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/44676540778.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/85669037281.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/24500141978.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/23220685670.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/2391812654.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210904140547.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8fifh1durudjf3jrcb47snue1q/xagogojujufovibutalawev.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/abc13f44efbd03149db7b8edfec6e652/86849707360.pdfIn PDF document text
    • http://mcutech.net/files/16109719695.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/34447334311.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/13301980737.pdfIn PDF document text
    • http://huntland.hu/upload/file/badurusivesevi.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/volalisunufikivimevibak.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/84670635931.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rlbn95h96q6aei188d12obqlsm/gavujisezabexudamivab.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/090113032461.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/voxawidometonebuviradu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340d90a7930---difedaxewufitixesalap.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/70817988455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=garry%27s+mod+free+download+pc+windows+7PDF 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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 11008 bytes
SHA-256: 5d36ed9ae0c04f96a0f988d1ea0486bbdd51138eb7e2133d40cfa22610a4443a
font_01_sfnt_off0000f7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E9 17232 bytes
SHA-256: 80231b28b062967090d06e56657c01f9fca4c858f0c8426151e7054ad9cc4611
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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