Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5ff229727a7880…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 16:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3629c3d377802eb0e83784dedecc54c8 SHA-1: cf2cc5979e6bf0cb35e3e481fe389968fd33f0da SHA-256: df5ff229727a78808800db0aa97e46d696b61f6ba4c6c75b1adb46694a57d386
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to direct users to potentially malicious websites, with several URLs hosted on compromised WordPress sites. The document body, though heavily obfuscated, contains indicators of urgency and recovery secret requests, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the presence of numerous external links and the ML classifier's high confidence score point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=remove+coot+virus+manually PDF link annotation
    • http://ozari-ua.com/files/file/16028269321.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/gibuxujiwenosoke.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfc262d6f---5702567245.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/53edf2345e79ac2cef5d39487b919e33/gamabuxunan.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d9b806aa---19871830114.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/zemabuvit.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/bomababobuseduv.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/35458782579.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/88601638363.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/85299652398.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/vaxefo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-29/20210629030955598942.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/pitorixavejexixapaw.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/jafidosebogotilamexupub.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608632a71ef19---53829708340.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160791d1823635---nesuwane.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/57426478435.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/56161443203.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fedf91627183ee6d187597e485594971/dowavixowakufataluzakota.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92320b31c8---76427258418.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1097e14d5ca1db166080f084751aa5c2/62124268571.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/35820031963.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/23397982994.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098be6884c58---22929179966.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_off0000e8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D0 10716 bytes
SHA-256: 0d90c9e14c4e65b9ef7148d579101feb0819910fd9400c34a8776fa1c632325c
font_01_sfnt_off0001017b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 18040 bytes
SHA-256: ae8b77b5616f46e6b3b73e96ac6458ff5792ab398c569163b1358252e6d311a3
font_02_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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