Malicious PDF — malware analysis report

Static analysis result for SHA-256 320bce12a019fa51…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 03:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40bdca1b2988214233ad7788320ee22a SHA-1: 4d749d1e999d3c6376524dff46a0f8774082624a SHA-256: 320bce12a019fa519eb64a0e20ca5d8de13c1ca944c2dc18a2c9a14c143ce104
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=embedded+systems+study+material+pdf PDF link annotation
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/9013177279.pdfIn PDF document text
    • http://cwesp.biz/upload/file/50063294987.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-13/20210813152141352119.pdfIn PDF document text
    • http://santabruna.cl/upload/file/lezikunatitinigadi.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/fj8uvv62eg758bovgcvmn116mt/67647274649.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/xefovuxoruxikiposot.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/46327145542.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/dibaros.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9f0e795be5985207592f5ec1d84c949a/laxovuzavoratig.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff85b8543---45235647627.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a720dad4b8---31390857478.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/36169523482.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/balimiwuvodebipawo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ace6a5a2e---bazasolavexa.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/14711291782.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/vibitosel.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/zirijoxajenakatatonekil.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/jekevuralaxebetoxelepe.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/vopadunok.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/zopufebapawutide.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vurojegekawix.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/81bd396c682c161c25c3f1757a6e0123/59661693123.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nupitubopeg.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_off0000bde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 16576 bytes
SHA-256: a0f0104a2835663254856f7757f6a943bbd0e11400efdad9f268367b83f9fba2
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 10772 bytes
SHA-256: b82095496f80169a1af15d87c7bcf7675def8df0a0a20506979b7250ed3ebdac
font_02_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.