Malicious PDF — malware analysis report

Static analysis result for SHA-256 25be918b01eae070…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 08:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a69df27145268d8da9f89907fd55540e SHA-1: 81ec189daaad506316dc1c34a70cff239ba3f784 SHA-256: 25be918b01eae07013d940e71be39abbc079dad076570f0f65a0e40299e5f352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://stopguepes72.fr/userfiles/file/juzefowezuteladuv.pdf In PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d353c80f---jorutajipomanuwupis.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8475638a1---xikifurevo.pdfIn PDF document text
    • http://insei.eu/userfiles/files/bikakagakipenatipe.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/etcfe9dqbolionanoi2d5jrpa2/kukigiwedeponoroxale.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9241a1c27---90593121243.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1a96fe3e---rodatisuzonugedoro.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c55f1059f5d4bac387537583a983c81a/59368896697.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/mupizotabegugavoj.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/sexeriji.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/sexapobel.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/85172790928.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/65944189257.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/fegabebobopipowoluver.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e44b1a4a---32706864463.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160cd07afe88b3---weviwinapikozezat.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/xugovitinitesewawawerebar.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/fujawumonafafabo.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/78888204020.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/82df401e5b94d332c2c75534a96c67bb/vabaruwezixesoxigatuxom.pdfIn PDF document text
    • https://alutat.com/data/file/70061283452.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/bipusenezenupi.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/26210082317.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b93b9cc77---redigiwuvatefefoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+book+in+pdf+formatPDF 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_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 10676 bytes
SHA-256: 98c26cf23aae28aac029227a93757000854c22ffa337c435b00bc48f18caa089
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 17036 bytes
SHA-256: 0c2e1fc40e235040bda74e45dc14d203d2ef247bbb0c693767f84e4d6a5e7918
font_02_sfnt_off000117ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1