Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8cbaef924e0cc9…

MALICIOUS

PDF

108.9 KB Created: 2021-09-05 19:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f24f8e71454df31d544238d5906dd348 SHA-1: 4c1c0feabb047c247c650264033e17dd6c38cded SHA-256: 7a8cbaef924e0cc97e8ba38075fb4670f350b7f2f2dc8a3bf1749b437cd9026f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.zolmedis.lt/ckfinder/userfiles/files/7725844079.pdf In PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/564f5b90e7b20c63aa673ddb5c8a6c48/jevotide.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/vuzami.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/zujagup.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/natuv.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/13679541687.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/1852052108.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/51936870912.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/611f9v5etnfctlt46tj0lfd47e/xawufevowasigubutopugi.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/potevibidofoxebovadewuwir.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210719_081538.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8a9d7d45---95340871602.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9c987ebc7---82645167330.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/26867591032.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/goxekukonobonujorav.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161031cce7424d---24242142926.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/mipukagunefawofaxobuf.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/pabonotugikevafam.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104e2d40fd5d---nukivemipofekotel.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/82003960852.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f6b8a161f---duludavugigimemiwegeja.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/19743592206.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/perugakefosagululo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0cb9dd42---17230309447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=microelectronics+books+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_off00014192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 10676 bytes
SHA-256: 581411ab71d5bce91119ac50eaed7aae1fc59d661b3cd90dca06ef724c637b54
font_01_sfnt_off000159e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E9 19780 bytes
SHA-256: 90fa40618a90fe136eadcdd5e6ba5466775a07e0a3cc955aeacb1460dfe13ecb
font_02_sfnt_off00018d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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