Malicious PDF — malware analysis report

Static analysis result for SHA-256 410fe23c085a05c9…

MALICIOUS

PDF

98.9 KB Created: 2021-07-04 01:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21039af31b48772de7ffe801cb878448 SHA-1: 998c224913a7f1eef22e83652c074fa965f3b58f SHA-256: 410fe23c085a05c9e489772e9956f074a961141f19395d4791d26074da7987af
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm points to an attempt to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://archism.ru/uplcv?utm_term=liaise+in+a+sentence PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9cc6204300c0a8da9aa79a39ffec780c/kegememilo.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/dtv0vi1fehju89r1l2fch13nn0/sawomigixosipinesolutuv.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/bumokez.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/24r1dtrs1d77va0v45ptjmno3r/numobadenebokox.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2489a87a---25453907052.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b50ca5fea0745c55546caddc63f40ffb/lifujaxugibuzetejovupimak.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a589d8e13d6---vekajofix.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/86881626964.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/duzalibufadorakuwadap.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/69992440285.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd90485543---tusukazopudumufixe.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/60748081568.pdfIn PDF document text
    • http://www.celso.org/download/fupepelakelixilewo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cf47fc0af801c489ab17d9eb8c382b0a/modulumozodu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de1ea815f0---44712109738.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/28809693006.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4b7a8866b2a19a836318174baa1a85f9/wuretekixonanonatiz.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/zeraxogaranalinubak.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zaduzaganigabipafozamujo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7e18a6d1e061278c81f7c619b29b0af6/rapogekoxi.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/40086310264.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/29751315487.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/mupelivotitizotoletubiluz.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fec32bb44---79677624680.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 16560 bytes
SHA-256: 05b1599b669934a58c017804145c16778487009faa039016609a921b6a45af3b
font_02_sfnt_off00012673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12673 9916 bytes
SHA-256: 6186d98d7bfba19c73bf9a8835141b16ea447c78fa1d7ee471f683b5cb4c7df7
font_03_sfnt_off00013c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6A 2984 bytes
SHA-256: 37657de9374b2a3cd0d8441c352d01db9cfaf35341ae8ca03dea180b63ff11fe
font_04_sfnt_off000148a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A7 20920 bytes
SHA-256: 747c1bbb8da2206b1fd1fe4799d60120e52324ff46cda8f1bdc7db1b2949d980

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