Malicious PDF — malware analysis report

Static analysis result for SHA-256 8568f16d6e6f15fb…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 20:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6faaf541e48f40fb0ccaaa0ec0924ce1 SHA-1: 55d47081f5e3b38ed2b77bff8b0377e085fe4e8e SHA-256: 8568f16d6e6f15fb88401527bb1c18221a62c5c7e4544a125cd95f374097d137
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecompletecontact.com/ckfinder/userfiles/files/rukutiluxakoxuxupubakije.pdf In PDF document text
    • http://4bx.pl/public/file/52287998118.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/98447898151.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161054109b8e75---97707510875.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/xufovivulip.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nugovigivufopovipa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63086e6b4a---25003384380.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/dojibuxusofoturatufe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aao0tljqhm99ht3ji529rdi287/40225372124.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/025eb4afb5fdf423bd89d04cf06ee04a/lipojudidulobezifede.pdfIn PDF document text
    • http://ciskmv.com/css/file/jaxagalapezobapad.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b21b2fb9e---jubezesir.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/95511226828.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/45c9e8cbf8534432d1efcd0c6e7bd99c/jimafowujedumodiw.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/82657822891.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/wosukevimitut.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-23/20210823192154109797.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d528ab85c---31626595111.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/8052186595.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/97299198060.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/15055908163.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417db1c8f8---wabikozixikovoranuso.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/bowos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=full+body+fat+loss+workout+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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 15836 bytes
SHA-256: 1ad14747aa41a5eca398e14a5ede9c0b6a94c2c55dbc248d8f2856b79ce10e65
font_02_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 10672 bytes
SHA-256: 1ead1b46f8e60ff4434bcb5dd0eddf9c96e6e1dbbe8efa2c6ef55855cd55dd14

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