Malicious PDF — malware analysis report

Static analysis result for SHA-256 93aa78611a5f8bdb…

MALICIOUS

PDF

71.4 KB Created: 2021-09-15 15:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cf89a5f0574c741cdd65b6aab7add12 SHA-1: a3b54b648759b436c029434bd22e1770294798b1 SHA-256: 93aa78611a5f8bdb14f80c30ddf65623517c95e2c5d5fac83d3d7e2bb301a412
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/7741738368.pdf In PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/73894721605.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/fuwazewefapo.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/18147067059.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/79907746831.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/65852923183.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/fuwifejigi.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/nozokewarubifatoruzagese.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/97ea1116201fee6fbe91582c8366f434/66348077097.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/negotovuruxewojizaraduxo.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/28721278590.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/14443983806.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe5969a09---34694987898.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/lurolesufenedopur.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/femejugomitixinefal.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/33196835341.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f30b82b7a6---35836396096.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/govuwekimupemekova.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/romuvafataluwituri.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/52605352288.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/44692281047.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391938c1380---kuvewibe.pdfIn PDF document text
    • https://dellrein.ru/content/file/dubujopizun.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/zefopivilonogur.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/85278259571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=madea+goes+to+jail+123moviesPDF 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_off0000b682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB682 15896 bytes
SHA-256: 68324689069057f10d947bc71eefdbe789037957059f93446d6b29005f42b4d1
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 10920 bytes
SHA-256: 9760c637c31b9914fd0042c6271d0a504103f439fd9c200f23b958632ed1c699
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.