Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb51ccb2418dade…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 21:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19f96e8f6560c428f0a9af5b4ebe9be2 SHA-1: 8b524c7567286e1468168254789124e6c9bfea3f SHA-256: dcb51ccb2418dade5467fda405dc0947f1879f08d35446bc659a60f25ec94ec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=stream+complete+vf PDF link annotation
    • http://rkenterprisesonline.com/FCKeditor/file/1092786207.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/18141692261.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/rajumazemowadosa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/49526787436.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/75673798780.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/95874304840.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/mabuz.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/sorelasa.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/jadajezinetamigunu.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/denirapo.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ca58a5cf8---58704295280.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/sadilibivibami.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e446691fa---17610032387.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/58780622980.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/zadonasutebegixopuda.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/mofenesejinirilas.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/63571915443.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/13308286047.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161408d12457ee---54079815842.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/mebojutezigikogurusuzivug.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d02cc1fa93583b6af14b544daf6fa805/66416390111.pdfIn PDF document text
    • http://flomojapan.com/upload/files/17388957150.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/kesemodoxitaxu.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/rabaguwodeviba.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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 10420 bytes
SHA-256: 0e4e9e83fe0d735ce8e2defd688ea5f230b14c69a376239f721dcc35453b3b75
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 18320 bytes
SHA-256: 65db8285fe9ca71fa91270156cf02e81843f50087fa0aa20b54ee0483d00a765

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