Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0dbcf7db4465a2…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 08:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b66ed217f49764ca3cb0438464d6c39 SHA-1: be91c8a5b54abefc6da7ab451eddd41521c785d7 SHA-256: 9d0dbcf7db4465a210bdc2780dcbbcd9b61b9ed9df3a756c7ac8161a8492a00d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs suggest an attempt to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=go+math+grade+5+teacher+edition+chapter+2+pdf PDF link annotation
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a50d11e9---89721533434.pdfIn PDF document text
    • http://lucann.com/Upload/file/42986617677.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/27132831527.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8jernd78id36hb9k0vv570v437/7247044382.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad3ea7818---4120496482.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/gedeganagevoxesunafagu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/4q5of9ldofuto48g7ugid9ervd/23613335502.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/dc838c0b02aab547acb2f290ca445a9d/695527550.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/87972096673.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/18142781618.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/24126563645.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/46916318781.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jusokunez.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/60999592404.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021717628405206.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c60d6805f---barokugexawug.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/41005066054.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611dcb5f24c09---raxefinajisusemosubama.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/62976893841.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/44f0ac19dcd16663b863bb436ba83e29/borimumogalemofovu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1c3e055d---98439049704.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9cpn9vavr1b8nh2t302m0836g3/80453784287.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pudoserar.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9c3a5cd1---lagiwevo.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_off0000bc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 11144 bytes
SHA-256: 46c950fbc79408b8af49349062b0f2b510b2049d3ba01cd26dcca1ac6cf1a335
font_02_sfnt_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 16772 bytes
SHA-256: a733b42866b67d92cb1f8ed9371801f0c54e062d765f2d0ca05c515bc91bc680

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