Malicious PDF — malware analysis report

Static analysis result for SHA-256 6576dc25a04e4ffb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 16:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8f705daa5303695755e0d0c6b44d130 SHA-1: 5c160770570ee886811c8f75e3037e1c3db721e9 SHA-256: 6576dc25a04e4ffb78f1c2055fa752259e9c1c839c34328c6a122ce29e8ebc3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple distinct hosts, some of which are compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://gpsputhuppally.com/userfiles/file/deredazamodagag.pdf In PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/jidudebinapuzelefanedoxe.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630860398.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/58817414000.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/sibolelorubitu.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/88055111148.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/81854718900.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c271f06513a56c73da992e6f8c2fc08c/pugowulen.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/80834521601.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367c58ce2b0---44800641097.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/39373306906.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/78570526254.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210914_124827.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7801f2fa1---61615621904.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/61185500238.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/58537440448.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b9ea511b0f3791e2f82efef743c4619d/17801520401.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_180527.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109031405408672.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/80229829698.pdfIn PDF document text
    • http://abwva.com/uploads/files/15965256640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fake+us+credit+cardPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/8662660243.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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 10260 bytes
SHA-256: cb4c43f6a0b0da3038a55c8cee050ae2f64f14347666ee9edbdaa2af2b5522a2
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 17408 bytes
SHA-256: 1dd2a47f6eb1e4ae04d19cc6f44ca49b9a16dfbe60eddf546ae6b7074e68b4bb
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1