Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb19c190a7ebd5e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 06:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 756fef0cbf391dd171ac1764e99b456d SHA-1: b8f55ec016e680b11d7d55f16c8e20b9f14ac104 SHA-256: abb19c190a7ebd5eadc52613c1fc5b3ee75671d653ed2191e595b6773f025e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://vandervalk.reviews/app/webroot/files/userfiles/files/baxofofabuxu.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/a2bc34aab91c1aa8d4c4ea214e628f4c/18878821760.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/priisii3910ocvl4m282bsi9i7/97580162147.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ed4bdcf80---niseg.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a43e2b85---zopadufavinonike.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/18835265749.pdfIn PDF document text
    • http://ymmicro.com/files/files/zigewilunakuz.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/xavotogitar.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/72815287490.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108170554192654.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b11d2d54---xopisufipekukaxezuravujef.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076065f82e33---pitezekulafabetodanif.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/manasatij.pdfIn PDF document text
    • http://edisonprivateschool.com/cote_dor_import/admin/ckfinder/userfiles/files/furaxexowakotinejemop.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/danumumejuvad.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/muwufudo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7e4bbacc---lamajososovijugi.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/puluturatug.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/25868000893.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/07c721e9e8578f20d75a9c90db86f708/20290182979.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/nuzariroselivuleworak.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/xezapomuzisuxatawix.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d3890f5a---74853202218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=jyotish+shastra+in+nepali+pdfPDF 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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10700 bytes
SHA-256: bc28ba0956a09bb4784df6655298302ee45514595019c98396399bbdc721ac40
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 21640 bytes
SHA-256: 782929a1ff0742819cd535e0ef2ee3eb4baaa30cdb03c53fae2ff548c09959b2

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