Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e69f51a1511c37f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 19:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0ebc62fc57c99e896b6f859b947fec0 SHA-1: 8e1d782b42518259ce29b39ea25ea86bb0a8e57b SHA-256: 8e69f51a1511c37f20b086fb39ed616e482d927b6f87ecb166cca443035b116b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=high+speed+networks+and+internet+by+william+stallings+pdf+free+download PDF link annotation
    • https://feng-shuiworld.com/userfiles/file/23502252428.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/91580885478.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/vegugolo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613894d64dabf---deguxipesoramenanisefitun.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/fafik.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/mumofojiguto.pdfIn PDF document text
    • http://sissonne.hu/editor_up/supokiwud.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/830d9b315c50ddf265315d953c94439c/73844518862.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/91985547214.pdfIn PDF document text
    • http://teifsepahan.com/files/file/miwiwiboropajapotoxi.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/velov.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/87705973340.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/dipajutazaniba.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/23350296924.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/b7fd30ecb13e5c88af6190442fbcdc10/57096845351.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132443ea7711---pubuwe.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/4425712083.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/fb782df14707dcfeb0839f04facbc5d5/kiruwitelidepatudo.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/jopowajixadogubazuj.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/mivojifilexunojokogolute.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/lenepekesawazob.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/67293943487.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_off0000d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 11368 bytes
SHA-256: fd6e2da5cbd94b64b83522ae889070762606a3c041d2be6b03a600f6ab3fd9f7
font_02_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 17316 bytes
SHA-256: 580d687a82ca60d5b7cbcb3fb14fc866e3fe0f8f8b96334acb8dc2fe696644ca