Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac54849d0c5c91c8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 12:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b3330a9428f82248980bce6fb95f5bd6 SHA-1: 690da959ebc4648b52fc4713dfa84d3fd2811472 SHA-256: ac54849d0c5c91c8c561555a3bb666291e782225ac640e13a5e40b06671c8518
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common technique for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=free+movie+streaming+apps+for+android+tv PDF link annotation
    • http://ctyrkolky-gamax.cz/data/dokumenty/67705506857.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f347502a9---54039038981.pdfIn PDF document text
    • https://plasy.com/uploads/file/patozo.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/44444454351.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/raa3avq44696o4mo1rltif4k72/8627605057.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/duvexapujudojo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9d749329---25248927783.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ihfbvdn7irn3b30hdcddnfdtp0/puzibotifufiguru.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/vedebipemujupiv.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/bawepunalaxaxuwujareg.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da45a33d39---fesosegotofos.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/tilitibebif.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/juparevaxuxusorot.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f5b3f8a8e7911cc8e62e297df70a4d50/23115365993.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/lejudogejomitimojaretapum.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/9957560489.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/zateberawij.pdfIn PDF document text
    • http://atrsara.ir/resource/files/87734770984.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/30977772452.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/41935820359.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/32578268061.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/muvopuxi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161364222710bf---19730149081.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kamurukiv.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133edbf9ab75---binidumuz.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10836 bytes
SHA-256: c8f83aa3e2dbafc2613bb25e64bcb13ff5d1ec47d62503a39b20332032c6b5cf
font_02_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 16912 bytes
SHA-256: 3d656f7de83f26268ebdc10dde790bc1e1cff93ee238f887bfb45db839f8a5a4

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