Malicious PDF — malware analysis report

Static analysis result for SHA-256 234a0b6fad34b061…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 12:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f77c76cd1900ef7fcbadbd85a0db354e SHA-1: 650a91eb9902b84a9b2d6f624b107fb650244b12 SHA-256: 234a0b6fad34b0614c955fbb9605e15ce1efacbd1d85ef4a67a5e8ad68399265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are strongly indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cd1d1f911d36b05a427b70ec98ce43b5/buwud.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5aadd8c797573ce8135ea5ef919bab23/kojuxijurum.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/90017021589.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe87fb68de8---viduze.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/84113675049.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f364f186d0---muxuvidavukesuposog.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/53900387782.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983fbd7e9a9---35196404869.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/fiximewofero.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0859b340---71909798979.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d96b351feeb---tagiwuvirejaf.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/417830644.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/33326211223.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80fdd7c2e---95482435162.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/848d878fde17892864859d95ed4ab22c/niwuju.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a819330a80d---xenegisaga.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/wilaratumepeji.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160812dae09a56---pilijupidikuvupukijululut.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1c560a68483580a021573544bfda4c2d/xukoxirisunasolis.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/9ba7cb4f16ffd19295dcbc8d7fe3d8f9/77885579831.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/vegesuriveporiro.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/toredipemaviriluta.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/neluwolejixipori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=diabetes+diet+pdf+nhsPDF 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_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 17260 bytes
SHA-256: 5802887bba8084fef15573cec0e7788fb15bd6d6f4ef93d66ab522071b566636
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 10472 bytes
SHA-256: e5a4b8f5da9484766b44c8a0c12237587ce09686db674ead520796d2df800b4f

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