Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc55a9a72e93defd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 21:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 369debc2eb98200c35b9818a55330504 SHA-1: cba887f8e68d6f029852eeb3f8554be033f81a8e SHA-256: cc55a9a72e93defd2c754ffed47ce1d4743a712853b804fd298cc00ed8383b1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple links to potentially compromised CMS uploads suggests an attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://fitviewer.biz/files/file/49076818019.pdf In PDF document text
    • http://alt-1c.ru/userfiles/file/xogatokuxulipez.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/felitufokajibakaxux.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109121551062759.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/tipazilipezuzopab.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614699f8ea721---zopater.pdfIn PDF document text
    • http://esistore.de/userfiles/file/3340231926.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/88271595834.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/1248473683.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210913020343.pdfIn PDF document text
    • https://redac.ch/upload/xipobepupepawozosu.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/tizuxezukofugo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356dc55dbcf---wetuzafugokowizijebuz.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/56125851286.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/jozikelupemopi.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210905180327.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/fuvaxuvawodewaf.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/kewixumofuk.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98f41c1ba---31108136200.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/vunug.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/62013962731.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/xigikosabanubupaleli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pin+text+message+androidPDF 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_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 18028 bytes
SHA-256: f32e1a8cf1bbddec18e5a92667e756c25b9a55e775c4b341e6b279233e7e3ae0
font_02_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 10648 bytes
SHA-256: 348c6a16e7ab70d0e5020504dc0f4d09edc1aec731e67e557edc8518fc16419a