Malicious PDF — malware analysis report

Static analysis result for SHA-256 961c8145ca9078f9…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 11:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7addeca3e56d4102e4c54be286461ffc SHA-1: a8476286755fefb1d6b1c4f72175999bf256bb11 SHA-256: 961c8145ca9078f9c58edc3bd55ac9648ee4362deae20193e4df08c540d39038
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=bnha+3+movie PDF link annotation
    • http://meuble-tunisie.com/userfiles/file/gonefaleviwot.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/74259682630.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/nitede.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/kinaposapekamipugapo.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/zusokominanili.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/67268628192.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/werubodiwugukipapuzo.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/80669226256.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b337605b2c515b26a3a595f3d8229e5f/labanixojiwitupuworeril.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/fusuzitew.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/39509029927.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/zevoki.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/1600330940.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/metavofukibowolaz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405407edaac---21362668659.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/warid.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/32066543870.pdfIn PDF document text
    • http://apart1day.ru/file/fujewirubovexukevujek.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mizufemuses.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/tetizasetiwofikibutorodek.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/wowaripabasatokibufu.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/buralorivixudovowidure.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4631700a2---21691557257.pdfIn PDF document text
    • https://pindimana.in/uploads/file/sabuzarigasomine.pdfIn PDF document text
    • https://izr.fr/files/fenikesisoket.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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 19788 bytes
SHA-256: 934eee76d1ed3c60f7927c566c8bf9c8c8ae1c731333f303d43f0c05c2900f3c
font_02_sfnt_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 10252 bytes
SHA-256: c11fb67629fadf4ffff0f56eb7f33d851cc218a9218423508b6187a93a783fd0