Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bc864ad17aecf1…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 14:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d2e48897b2cbf2c1acf39ea4cc5988b SHA-1: 88409009f4c868bc06a710e032edd69ad90b9171 SHA-256: 93bc864ad17aecf1f636939175550d04ee6a754dcf6e5a8617e8139e96751e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=madeleine+albright+madam+secretary+pdf PDF link annotation
    • https://beauti-full.ru/uploads/files/51002150431.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc576b2af4---lurosuwezepitanamalejev.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160984498d439c---xokevobazukasakamos.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/82865902032.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/80419226670.pdfIn PDF document text
    • http://viorina-deko.com/images/file/kuwojujatito.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/uqcg5jtt2th8lde6h3jss898c6/xotapugefanosigadawa.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/62299384518.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb52eadc88---suwibetapurejijeme.pdfIn PDF document text
    • https://ksuskalology.com/images/file/58368861886.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/xunimi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eefebbf0d73d952803bb35c479676a4/lekinadenikiromup.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f4783d5e---3738316325.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/befovipedagaruzejidi.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/63690814939.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b05b13538---xilekonopil.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xezofenojimonorawasutameb.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4c34cc62f61b1dc8da0b5c0a58346fc9/gojesazijokedobe.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d56970f92b---84232554730.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/nedonapugitiguju.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/voxinunelefonebezifuwemaz.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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 11196 bytes
SHA-256: e8ddd188dc8cf2f34dbf11988a79cc2d5849d83cc8328b8ee2e22dd192fe3681
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 18948 bytes
SHA-256: 922b7a717a2eb4d5793fea3e5d55bb7f5460f023ed963be80e20bbd4e283271d
font_02_sfnt_off0001295f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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