Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ee6bb9ffa3d4dc…

MALICIOUS

PDF

71.4 KB Created: 2021-10-02 13:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 506cc6605649d3865b32a753cb5c2eff SHA-1: a6fd1eba5d8970d5bb5fc1bb597e67d6a5e63f29 SHA-256: f5ee6bb9ffa3d4dccf19b40e4ce7acb7c91f51d800d5ac1e4e433ffc3f53f80c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous URLs, many pointing to what appears to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=diabetes+insipidus+and+weight+loss PDF link annotation
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161562c1906d98---37439725619.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/94415235760.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/xopeni.pdfIn PDF document text
    • http://gensugroup.com/upload/files/botozobukufejosilamag.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/baposoxul.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/57080646438.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/fesatiwinizate.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/t017jpdslhit264u9m295dl0hi/3193209653.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b71ef656b6---91471802643.pdfIn PDF document text
    • http://congtyvima.com/images/Download/farokigizu.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/vosujibatulodevusobinaru.pdfIn PDF document text
    • https://groupits.cm/uploads/fck/file/mesutupakuwuvovixekuw.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/30743875024.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/44087247182.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/tumifujodevaj.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/83443762301.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd5c2aac67---fitodikar.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/67884698759.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/xolagosopefesetubonaji.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/sixufusi.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fopitatuve.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/45384853095.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_off0000b273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8A 10900 bytes
SHA-256: 3070148fa1dd1f84fa0872dcb0a0fb36f27cbae43eb4d0766772099dba859b36
font_02_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 17676 bytes
SHA-256: 4844968b8ea46e3bea6eb2cebf56e361634f9bb3d1b2e06c60756fe971d6ee13

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