Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91f19a16007989a…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 07:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed7096717d84100364edac23bed368fc SHA-1: 32b0e28be953f740ddc2a52d9505086b9f49da82 SHA-256: c91f19a16007989ac4c0cbf28b37d62c523e1aedcce47b5c04787f17b7494bb9
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. This suggests an attempt to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7669

Heuristics 5

  • 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
  • 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://vongtaytramhuong.vn/upload/files/tukubapisenokaliwid.pdf In PDF document text
    • http://change4best.ru/upload/file/jakesozevegumuxisame.pdfIn PDF document text
    • https://12shio1.com/contents//files/72575324344.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02ridqc7jm15fanf79h4fhhma2/57847066087.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/17090762275.pdfIn PDF document text
    • http://headrepublic.pl/images/files/85528316342.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b8775f8457a136b94c7d2e3755fb224c/laveruvenifilibe.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zebexigiz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f53dab53f---gofamitoxabofi.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/58911214925.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/sogufuxufaxomusonab.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/sodolekok.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j7d163evd76520mgk66bvg2vcg/goximopijututo.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/xufukezipexawamero.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/103d659d9b21b8f59f7981e7053c5e37/xaxewutomokul.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/puminug.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/27620da9360d0cd7fa2941824ba6d255/73705605189.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/19163352014.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d89651811---13690507976.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8hfm1p4ffuel7vcj2rplp8dv9e/10359982920.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/zodasesuvasabeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=four+ancient+beauties+of+chinaPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 21328 bytes
SHA-256: 0f5531d4dbc101384fa2f57c3f6bb2a168fbc0008270b6f64048ead1d168b79d
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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