Malicious PDF — malware analysis report

Static analysis result for SHA-256 8053aa85bdce131d…

MALICIOUS

PDF

88.4 KB Created: 2021-08-04 06:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e647dc4ee866afbd5078106aae6a71aa SHA-1: c9bb2360e4b529a0d67b08c2388fc98e0ec16194 SHA-256: 8053aa85bdce131d713ebbc6856a93b5ef36e82ad31b83c247b4f7af2435d44f
164 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further stages. The presence of a 'download button' heuristic further supports the intent to trick users into initiating a download. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=windows+xp+startup+sound+ringtone+download PDF link annotation
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/zobexuburag.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/11412447861.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/16e5328c022bc3f18fc1f045e2dcd3bc/28812194710.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/zerokobijabizusen.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d26936d91f991a3ef7bd0207d3b46840/16361710140.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e8628436d50abfbb4e7c7b47bffc2aeb/pumovogapowabixug.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3ea82a688a53e5c56e69905b841ed986/vodomisejawasatoxomaremal.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f64dde2a070ba14b065217710611f79c/60563899277.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/89262465460.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2225fcec24---77642714490.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/35161289523.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/xetujefukepunibasuporesib.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/32dcaa25d6672163027a288de4974440/watosovufojipavokulajuwir.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/72970957599.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7abd1e48d---gaxijojeloganetaragireriv.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/nejuz.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/72248562265.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d529c7685---99598299597.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/49a161cad0d6f3664d8faa612fbfd067/4739988690.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6c1742c9---54581796693.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/91858185059.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d0f992f338611e6f7e6163ae5f560f05/zesamigevezukijaxabukado.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/gufixapironexo.pdfIn PDF document text
    • https://strechybenesov.cz/content/514446604.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/01395c370c7b3c138496dabe1697ce9e/sodejadoboguwuveragalum.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/28270574121.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/31666952176.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/2vdfhdvp33t6ctrqo6lah1qvh6/60645966197.pdfIn PDF document text
    • 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_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 16920 bytes
SHA-256: ee9558809d8888f949f66bda90a7d7ecc12282d9c46106f270bff487e88b3b30
font_02_sfnt_off00013987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13987 10848 bytes
SHA-256: 3b0837e3b0f4bb619f719a49d8a74bed11f16005a5e6b90af45174ad6a3781ae

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