Malicious PDF — malware analysis report

Static analysis result for SHA-256 90470093b35cee16…

MALICIOUS

PDF

78.8 KB Created: 2021-07-17 06:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c768d7a5c6cfd0c86a87d95629511737 SHA-1: 599bd75861d365796e7304bd1ac2f96c9db42278 SHA-256: 90470093b35cee16a49bf02220173952788747991080f09c1c54052968070317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to other PDF files hosted on compromised WordPress sites. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c3045bcd41217735c1334e12ca386fbc/37690664839.pdf In PDF document text
    • http://bannermaul.com/userData/board/file/reloranutimesorux.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6nt00nsq6dcmvvvp2k3d05c3d4/nosasoxo.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/48f5f3f7971ed7ca31aa5e8662d4a8da/faxedore.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096330317296---josifuzoxirewafidesev.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/765cce443dc7a2963aaa3b01e7abb0e2/dinejewodudazimuzovesi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bf2d18ace3---38389364445.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/32681927360.pdfIn PDF document text
    • https://kede.org/userfiles/file/zezowutuzolupemizire.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f0f8583114e61920616d9fe470a79b95/88687996182.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/d99a1fbe9a0c837a16bb126174b280da/fapaj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5870875959---78809956697.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8903673e73cddb95ec3b054262147486/zugelorenugopo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/sozudif.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/6f5807a66437697fe17c8520c373fe76/89143197592.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/10503147974.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864f741c7eb---vobexaz.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/66875522248.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d58cf134---meneso.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/60506880680.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/xarowelozomodofa.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/29128715066.pdfIn PDF document text
    • http://babamoleskine.com/files/file/jixodukavupitiragugi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/68585675370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=not+equal+to+in+sql+for+multiple+valuesPDF 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_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 10808 bytes
SHA-256: c12dbc10eafd39bba233401726a9bd2e3fc2a05305887bcb6501b40f9cf42df6
font_02_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 16996 bytes
SHA-256: 237ba8b983b9e725fd1c8cd4851a8388ab04b1225d4c84b487ef3a7356a4e781