Malicious PDF — malware analysis report

Static analysis result for SHA-256 749b73f69c90c0c4…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 00:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b9a0b019f9cacbf12c81a8feabead31 SHA-1: 61a3898ab156c3fdd4a6aa5f3fd7ced922e27b6a SHA-256: 749b73f69c90c0c43d599d37e879a5490f17300e8d4d807fd2d07a7024e7d64d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, specifically using a remote support tool pretext and urgency to trick the user into downloading a payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://kaowei.tw/image/files/20210603_105054.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd49c34de0---rawugovuwijerik.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/devaxati.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/43887f96a4f2b39302b15fb783319f69/silalezufozanopodigosoz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b6042075---likakivenilijeropog.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6558e7bedb---88609628330.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc65b241e65---todokifuwikojozod.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/99630026662.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501050731711353.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/figelaxovogazadogeso.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/313f4f80a8f6eb864d45e5e98230c659/bumifeberorigibefinidib.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d3a20ffd8d99bfc55bac69f74af0d6eb/fidazosobapekisofadax.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/nanvog2etqkh4ksb20jper1bct/38455465479.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0a828e02d55f990a37f33a2718b8bf7a/soxatofidadebegipezenupi.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/4701de43912b65067d410296ed413642/54845054354.pdfIn PDF document text
    • http://ashioke.com/images/library/File/fivimefemosogenuton.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda16e1f2f---75896419154.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/17693336852.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/97a2cv3fa3kei5ehssbmi9sjt0/82725032447.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/zebevefifisemiguru.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086540858712---28895451270.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/xafuk.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/22920865120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=speaking+clearly+pdfPDF 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_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10692 bytes
SHA-256: 51ba6f6db88b5256550e1a15e977b78bb3bb8f4bca37c35c9507e526a8f76461
font_01_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 19816 bytes
SHA-256: f2cc7c7f94a03c39fa48cc9667085a665f212cbb1dd5f77bfedadaacdd059cb8
font_02_sfnt_off0001458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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