Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9864697a16cc86c…

MALICIOUS

PDF

137.8 KB Created: 2021-07-06 23:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6be813e3138421c1265b2e11e4186dcc SHA-1: f2a59538cb811c6b86e94d35d97690274dd49e8b SHA-256: c9864697a16cc86c76db7d1866eb203ffb4e4c0e9ab634adac13d74b91dedf48
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads, indicating a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=right+patient+right+blood PDF link annotation
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/51354532599.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9e51812c9dacaa7bfd25288cd1cd4bb5/72597518154.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/nazikifevugiwadeputegup.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2b22513d934f4e2cec8f7dd6fe9bf2d9/26806318121.pdfIn PDF document text
    • http://www.emailposte.com/pictures/giluzuzitoruxetanogo.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/53491154888.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lonasanaxeninonepix.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d743651901fac687631a36618b8ba8c0/mofixo.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/derikawofokidixabijejeme.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/e346a51571708098c9cfa5b26a99f225/41339541478.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807295a820c---35561340336.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607440cf810b3---11899226316.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/fikegara.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/qq12f3ffgl1f7tqappk965ebq4/26627195710.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/873e5138b578a2308fa24b16a623e4a8/tujig.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4098183a9---jafat.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/dad7f5da7191ac237345d3f4f375391b/99497625686.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e101f187a4c87a5fca34c3b38a98d728/pasexafu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083644401ee3---rebewevividosav.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/mugubetav.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608141d89736b---terikeluxuz.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zovisidotuxisufo.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/wagibuxodubapin.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_off0001b901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B901 10688 bytes
SHA-256: 7c7cf277205c0c790d1706386af019f4cfd2ee52190f1984aea3047a968bf64a
font_01_sfnt_off0001d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E90B 17840 bytes
SHA-256: 1e62f18e0cca5df00d1b7fdf050c3a43547eff82f7296ac155c948e220e8c21c

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