Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73a4daaf4a47cba…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 22:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef6f41756f112f0c994149ed8c13b2a3 SHA-1: faea495016f56c76e2bf344ce3f69eba0db829fb SHA-256: f73a4daaf4a47cbaedfc644443bba7f4dcabff654cf50f5f94208669290b561b
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://townofwinslowin.com/flash/townofwinslowin.com/file/sisowoke.pdf In PDF document text
    • http://mobiliteit.nu/files/wikufopixalasap.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105050206266165.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f846c6ecb642801edd5c17554c5ac366/laduked.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/ruzilisogowuxumasuse.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210605_3E8E3DC6354C347F.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/40732286316.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/rasedasifuditomit.pdfIn PDF document text
    • https://jss-moms.si/upload/File/titumibojaxax.pdfIn PDF document text
    • https://sanidom.pl/img/file/lopimafolovipinive.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/61085494234.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/17cf7fa156391349f7f0d80c334e9602/36284576944.pdfIn PDF document text
    • http://ladna.pl/user_images/file/7480034334.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/17814221491.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/93900174192.pdfIn PDF document text
    • http://www.polni.si/Images/files/misarefabitisaguj.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9b846ebc---90725411905.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daaa8f5ef0a---40821048804.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/wanemagudux.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/felakitidiras.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/xomexazokuseruvebozaladob.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/bojogezim.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7c6d677a3225e7d099eba32d91557095/kojolipitag.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/65416017100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=2013+dodge+durango+manual+neutralPDF 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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 17988 bytes
SHA-256: 87aa6c868299b5476c566812cf6e7caed4622334b1efc8768aa5190883cf7b19
font_01_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 10800 bytes
SHA-256: 06647b3cebb405cb50fdfbf90ccd5918bb6b451f19cc8a16af1d2caddf6a8c3e
font_02_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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