Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9325cb71ba7b07…

MALICIOUS

PDF

96.4 KB Created: 2021-09-20 04:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0107aa4e9686781f224387ab1697b0c SHA-1: 894d709a1b8f6120baf652959c746a08379929d1 SHA-256: 1c9325cb71ba7b071ff7e3770106cb60a949eab727366d74204793a8f5a73335
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=pubg+kr+update+2020+play+store PDF link annotation
    • http://erainbowrealty.com/userfiles/file/xodoluwavikobinalavijak.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133b313db638---77862765175.pdfIn PDF document text
    • http://househouse.it/userfiles/files/lumuboxaduvazofavereve.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210902_47b84.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/zedixizusami.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/47674677928.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jeviturufunuminataw.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/83870565092.pdfIn PDF document text
    • http://prota.ru/upload/files/luwekonazovigutof.pdfIn PDF document text
    • https://dhesient.com/media/36311731541.pdfIn PDF document text
    • http://tfforming.ru/d/files/15946217926.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/13089889017.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q6562avr5fs7a313nj7tufv520/puwatevizanitalek.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/91086933576.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/16594730351.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/morexasakolag.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614706bc2fa3d---wuwuxapipawojowuzuf.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/95708725527.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161449d15c386e---75989196196.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/5544098056.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/jelamelutamefufi.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/15546968415.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/rojawijemivapij.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_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 18108 bytes
SHA-256: c5eb9019be842a2f71924cd59e8df1a57f7f9da0a52876de18c264175d5f798a
font_02_sfnt_off00015a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7F 11060 bytes
SHA-256: 372f60c1efeca4bb28dede91bf63c483f765ef7279578eea7decb52f1662605b

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