Malicious PDF — malware analysis report

Static analysis result for SHA-256 a934cb577b524c13…

MALICIOUS

PDF

98.0 KB Created: 2021-09-03 20:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac11a176ac197506703f967817ff4c69 SHA-1: 34adddccc71169d1ee5d90707653f620e26fef3c SHA-256: a934cb577b524c13cae68c62cc02598a68ed98f5de53890a3f34cdc7072e29cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for downloading and executing further malicious content. No scripts were extracted, but the overall structure and heuristics suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://medvor.ru/uplcv?utm_term=ktu+s5+ece+syllabus+pdf+download PDF link annotation
    • http://ayurvedicclinic.org/userfiles/file/jimusudopizewutabixibigaf.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4650e004c---7986679926.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/2028872111.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e534272b2---49830727596.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/xegesotowurujovovabag.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fe275489b---mikuxijazosabiliz.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc35adfd51---83792664154.pdfIn PDF document text
    • https://medpressa.ru/files/file/17841245295.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/vipanebawujazosar.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb468f057d---84993705986.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///luwogoxadonareximidalifuj.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161123d5ca829c---47601402941.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091abecba596---61905183892.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/tikemunubewuxi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/pozotugefubuxugonosag.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea9eba2b47---8130153422.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/59913524276.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/59775511521.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/12813636590.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gajejolafux.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/menaserod.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/91037409335.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160efd8be12ae6---80484973764.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_off00011caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAA 16804 bytes
SHA-256: 059164c79a94149be69f5c5e602179ccb1cc12f53b2e85ab3083a622e5c1dc2a
font_01_sfnt_off00014891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160A8 10984 bytes
SHA-256: 1e3a5c9b855db1b7c62e4d8d7af8b4fe7a9e222d773e6dfb4f703159d53690a8

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