Malicious PDF — malware analysis report

Static analysis result for SHA-256 09061eb4e4888d44…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 19:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91926a9b3b36c6891396568b369c234d SHA-1: 1c3af72924810805d0b6252c1d938792c10cf474 SHA-256: 09061eb4e4888d44ddb554979e9edd3011a3482be20479a8bf1e0f4047a6d5d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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://miroslaws.com/ckfinder/userfiles/files/purubujepeludofunog.pdf In PDF document text
    • http://studioguidobarbieri.it/userfiles/files/migas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44e55e631---tivak.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/pisopikusomag.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/33121206815.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607812b03d1c7---28322276487.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adfd2a5dd5---36905913708.pdfIn PDF document text
    • https://labelmarket.pl/data/file/nusedowofe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd4fdd399b---6478498001.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db54bdd04a3---73735912774.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f156c42f51---68879628577.pdfIn PDF document text
    • https://lesura.net/userfiles/file/4218404525.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/bepaz.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd94b64ab1---xevasadatexiz.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c288fcf6f1d80b65a2c530d461295b17/vifidubunamagoberej.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/99309312358.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///93738054009.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/daxanamulotagopopoboruwum.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/520cv6b4duch5tem8vsqnjrhj5/11722277310.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/retozeradivalunazis.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/juripitubivusabuxir.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/45597768790.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/94496134483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=physique+chimie+3%C3%A8me+exercices+corrig%C3%A9s+pdf+tunisiePDF 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_off0000bafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFB 20416 bytes
SHA-256: 07465679241f7a336a653c289be6b8c4c0eb21a781f7da38cdd919f3b6a8c025
font_01_sfnt_off0000ee75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE75 11804 bytes
SHA-256: f9874ac68c7c6e7454992a4c9141fc8622078949665af9d24386bbeaa36e7185
font_02_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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