Malicious PDF — malware analysis report

Static analysis result for SHA-256 6900f28c35e8ea73…

MALICIOUS

PDF

79.3 KB Created: 2021-07-08 18:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 78acb7132762120f2c567da12ca4e510 SHA-1: 55477be6b243625eea57c4fcd91e94d5589768e5 SHA-256: 6900f28c35e8ea73e5cdb1ae25235c77ba53fa0f553c0a9bdd37063062431d4c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, directing users to multiple other PDF files hosted on various domains. Heuristics indicate these links are on disposable hosting and potentially compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://purefeeling8.com/data/file/lusumek.pdf In PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/vagosifoxonomuxe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc1f4477b---29468123029.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/j5u7p35jq1n9huntt1gjbqn1fl/kolegipurufuvaniromixenog.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/kuvitakamuloreviduzu.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/monelutasopulobinub.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/1335d5e6e6fa3d7466064d2e548c857a/37296207132.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/47a2ffd327dcd28b8200c590c8ee4902/wuravenapepemonopa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/90453d775f4f7303bb57b4d7d22017cd/lafikukufotuso.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ee2b340e---bixokikatutub.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/44254787846.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/2168541047.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b1512580448395e877ffa132f18bdbe0/mokafivodejolurejewis.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/vagisuz.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/36195181932.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d279be390c---24376576070.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608348703640c---nigupixanagepofa.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/5rd35fju2t7tu9k9hm0blijaag/99657417671.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cbb945d46ec8e1982c56210f74868562/zivodotigamunokotajodo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eb438bab00a1731fbe48126e22e51a75/34091852313.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c837581540d27ad456dc8e553a0c1e67/nuburelet.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160785860e4473---76965686310.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/70909438044.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/29811425529.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7180a1e78a---fonozolemitovi.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/razozusiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=8pm+ist+to+edtPDF 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_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 10252 bytes
SHA-256: 9309c288d58095ea72542208bcb4adfb2c4fa33e2a3a891e85e8693910778675
font_01_sfnt_off0000e94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94E 19308 bytes
SHA-256: dd4ebb406c2a184a3660245dc481b9863352c8cc8ad0eda2a851d1e314d3d1b3
font_02_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1