Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78672c2bd69562a…

MALICIOUS

PDF

95.7 KB Created: 2021-10-10 04:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e03bb62bd788731a11d64e79d564d4a4 SHA-1: 120ffc388ecd733ba88ec00dbb262c85337016b8 SHA-256: a78672c2bd69562a201b9ed0c798ee81a1154d819deaa1c30b3cfc265223dca2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=about+navy+courses PDF link annotation
    • http://ewtch.com/upload/files/gotapodemixadarasom.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/70025015061.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/lopabupobibowevo.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/buzonidefudazavobuvamob.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/37800486578.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/bupawaxujuz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16162043637e13---murirudenonapale.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/viwideje.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/razedibeluf.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/96483838238.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4fb48b2900c0ac9359641a35d3f89c9c/22203116119.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/79803312261.pdfIn PDF document text
    • http://camonetinternational.com/files/file/xotorabemalugobar.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/47711662053.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/71282514087.pdfIn PDF document text
    • https://ksboutlet.com/file/files/85688634256.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/xipewabikopirej.pdfIn PDF document text
    • https://km2804.com/ckupload/files/ketakepam.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/73772457867.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/fovurifidimunidomeguned.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/04d82d73449e62551f606d60210f1d8f/9903991616.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lugibiwu.pdfIn PDF document text
    • http://espwireless.net/uploads/file/bedafejimuvekujodeses.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/bekivikisuliwukuganepobiz.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_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 10484 bytes
SHA-256: abc60109fedaea3d0a5e5bfa8999658891d98211ed97752ca5a91ac704b9a26d
font_01_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 19272 bytes
SHA-256: f94a22fb9f4eecede57c2174675757d3fd26a39ee1e2b87d0b8d7a87be8def75
font_02_sfnt_off000159ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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