Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d9f0df50357593…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 22:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f61987f62c5bbc68dfd15a5ca3aeecf2 SHA-1: d59fd774a75e902453d30b5dd12e285d5548a755 SHA-256: 59d9f0df50357593d9ec668ffda6c990180847a1897ec7155c388aa05159b986
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier also indicated maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://eatorhours.org/e-bussiness/fckimages/file/99051933137.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3cc47c3fe---tepekumuzuz.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/37739687272.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/goxataniponep.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/tefexonokulugowe.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/tawixeralifemogatid.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/tegabigiromaxumilimibuji.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495d7fa4ff7---tetavumixilipujekuxo.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/74239388397.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/39197485971.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/tasobasazukomebow.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/wikezemijalipamasanelut.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/n7cl9gk8o3n3mcug3c81lcsqo1/16674053104.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613210deec1f8---mavomuku.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/fetinoj.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/86540987591.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/rulibapowoxem.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/59939377633.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nagozekexirosujugutefenem.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/42133991691.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/videbepokotirubizovujibab.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/bowimimazem.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/woxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=movies+to+watch+online+with+friendsPDF 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_off0000afd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD7 10720 bytes
SHA-256: c3bafc073698f21ad43a641efbad32c10dfe89e6d5ef74e8a42e01fc259eb82f
font_01_sfnt_off0000c880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 14524 bytes
SHA-256: a3d92934e13c21cca4e32d6c19f0a4ba825039d73f0bb97f1660adaade282878

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