Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d21c4e0ccb80607…

MALICIOUS

PDF

91.1 KB Created: 2021-09-03 02:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00dfa68fd4b5fd7766583a58f479718a SHA-1: b9b66892848e9b60b3a69d3c5ad66b173d9d69b4 SHA-256: 8d21c4e0ccb80607695a254c925fc20548fd8f30618971b5c012a47e50eff1dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely intended to lead users to download further malicious content or submit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/24f4f20cfe51c5deeac55b74dd4489fd/lojebenujepavarulokati.pdf In PDF document text
    • http://klccpa.com/userfiles/file/tudufasanoroduxiba.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gumatelatelo.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/poruzoxobuzemupo.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ce8ad3bb46f03cb63e94e4c61de2bb18/86217913807.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6467443f7a---sazukavunusoz.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db93d12be3b---72372867833.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607768ac29811---69994174000.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/21851473550.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/dovenonizidarukak.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/wogovodawafavakinoroga.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/22595755183.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/84879216408.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/xuxuj.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/tanaxufivisusade.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/48134177403.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1611c9fe6c34bc---vomadonojiderit.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/dexajasi.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/2215101643.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/tudopimilefimosewetiz.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/1637743359.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/degukewenovowezazolu.pdfIn PDF document text
    • http://polletnv.be/uploads/files/27761399452.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607afcfa0798e---xuxaja.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/xaruxupivibobikebix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=infection+genito+urinaire+chez+la+femme+pdfPDF 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_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 20020 bytes
SHA-256: 5109612911506ee50654969d848242ab9856e1a05c3b9e8be36471755214f87b
font_02_sfnt_off0001457f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457F 11012 bytes
SHA-256: e7d2b47bda76a4607215fa3f9b3c807a966079e1280012c9656f69ccb9063563