Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9267da17318af6…

MALICIOUS

PDF

90.3 KB Created: 2021-09-04 04:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35892f35ea61c6c91843a78528a1a948 SHA-1: aabde192a006841f14c3d27678ebe09bd3126b44 SHA-256: da9267da17318af698b54c9db6eecccea303019e60965457c8fd5a0e3467b751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised websites, each hosting another PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to download and open further malicious documents from compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://olgunbey.com/upload/ckfinder/files/godovapizatewu.pdf In PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/75491484120.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/51355118692.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/fapuwokopovufunekamigagel.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/40e56ee7e5423c5dad89b686c7cb6a93/53377077000.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zojuwusubariwera.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3e4a0c3e30156518f325fada1aa91603/16503109174.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/ritomenepetosapugefif.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/wegurolivikigu.pdfIn PDF document text
    • https://jjpremiers.com/files/92236133082.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb82aa6ba3---duxopati.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/69380435031.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/wigumavarovuwifuje.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/gafeza.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160711da1b10e3---davidixepepemowuviginam.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vulavizemezetelutu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cvlm8rlu00kep90pibvjjsfnhj/71230098517.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d3ebc5e5---98839189791.pdfIn PDF document text
    • https://actorconseil.com/files/file/86902203626.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce06b17802---31052405839.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/pafeku.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/1079719213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=substation+design+volume+vii+-+pdf+onlinePDF 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_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 18096 bytes
SHA-256: 284d8fa4f1cd61b570d117e6fe356a7afde0f4f67cb27dcc7fafec265b997eb4
font_01_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A0 11156 bytes
SHA-256: ef754eb025d7c986a8ffef5825f6d7e1ff7a61e8843b8c01b559cc5ea7311043

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