Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6662a43e504dc4f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-24 02:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47f2b28bc471f9d3017e3097fba978ab SHA-1: 5c4efc90d48f8a8511065d6a3664096fb25db68b SHA-256: d6662a43e504dc4f6c94a6c98d3ae50a67ea014509999979ccab49d2318edbd0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://synerhu.ru/uplcv?utm_term=how+to+transfer+everything+from+old+phone+to+new PDF link annotation
    • http://irina-beha.com/ckfinder/userfiles/files/78203986288.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/26417296320.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/28540888530.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/71960865559.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/korugiwozox.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/61079287850.pdfIn PDF document text
    • http://aurora-c.jp/files/files/62182018320.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1026eb1c3821f2b210073ef7ec98acc6/dowodidas.pdfIn PDF document text
    • http://fruitsad.pl/images/file/lanozimumupuge.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/97085687474.pdfIn PDF document text
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/kefotumikisodanes.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/sigibikodapuvojewilepez.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/fenuguvar.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624510b5c8---davonunanuje.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/monulorimibane.pdfIn PDF document text
    • https://cristalensi.com/public/File/xazigolawasojaxe.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/mobebiromodurugol.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/jenovimewavin.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/09209e028f0bd84ffb9ddbb49fdb155c/93763844262.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/44837685718.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/95519555211.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_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 11200 bytes
SHA-256: 3becf03c345599b1f25259a82abe0bf71666b3f46fe893a631de8cd5c0bab953
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 18628 bytes
SHA-256: 4777220c4cb98dc88d1cd034dc9dc5aa3c414020e4aa6ee7c62b3462eae4ad6c