Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0da41cab03c123a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 18:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fd5c038eb77e18079ce296ca67f2271 SHA-1: 9958befca0e9af1853d91bc9b6d2fdb762ba6207 SHA-256: f0da41cab03c123aa68a71afb9b1de0e162d9696ac153de4b472f83d9601954d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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 http://romangruszecki.com/uploaded/file/98826223795.pdf In PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/ramamukakawi.pdfIn PDF document text
    • https://12shio3.com/contents/files/32794691101.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f721208a---77413538961.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/32288253048.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613956d343936---junigiruwetawuvufuwawe.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/7904178857.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/72334739039.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/ritugerugazukut.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/rubozag.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/gevejasizo.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/zawefokikaj.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/rudanewemubabevave.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/da24682a8ce3bf387fd38cbead0466b2/zadeporefifojasage.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/93597010876.pdfIn PDF document text
    • http://stl-hk.net/userfiles/84310042111.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/96785201444.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/63592009467.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/17145872776.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/dadoza.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/78879521316.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/17912415227.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/lotezifosurubalakiz.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/59193012574.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161326652e6127---12990953924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=widget+android+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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 10252 bytes
SHA-256: 651540f214eb135763189640dfe49e8fbed427da97188bb30ba78e32fb376f71
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 17144 bytes
SHA-256: 519be603e5612c0d50c854909a5afd2673b83769a236d41766f423d0eb876e61
font_02_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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