Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce24e9eae14f3f0…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 16:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92398b41635ef4403a5f326cdc88cc9e SHA-1: c45374c791cb6174834530e16e7415bf218828ce SHA-256: 2ce24e9eae14f3f0a143d2576ae44e7bad5f600d0c842a04fab83dcb715beb0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=fast+followers+and+likes+apk+mod+download PDF link annotation
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ee583227eb055b6e94244420334ae763/xinuru.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/18055540486.pdfIn PDF document text
    • http://mastervin.ru/files/file/dejobubogudobel.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/30849258245.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161456c7133df9---xenunadod.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614062d00b2d1---zuzakuraviwusokav.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cm8nb2a1cr2gncdovr1kik5487/76441768551.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/narodomiduluwoge.pdfIn PDF document text
    • http://imprezka.2kc.pl/Upload/file/84863897059.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/60644271699.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/vowewebetigejanifa.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2caa4ff87---zivimopoxusezati.pdfIn PDF document text
    • http://boardmark.com/files/file/vukixulubeva.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/vavelopuferovube.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/lirewajigikazuronekiguf.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/sodoju.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/bibubife.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/wugeber.pdfIn PDF document text
    • http://ge-mak.com/files/4036525691.pdfIn PDF document text
    • http://cartopack.be/Images/file/delepug.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec06350d52---45521241029.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/dubulovobunutawuvimajow.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_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 16784 bytes
SHA-256: 0423c1aa0dbeba4c9580d3fd5544b85b32a418bb320786681ba1e8256c99bcb6
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 10816 bytes
SHA-256: 03e13ea88a080a2702fe3076e4a976712045ee72e5d04b0e612e3089324321db