Malicious PDF — malware analysis report

Static analysis result for SHA-256 642513607254971f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 16:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 372e8352ca2ceb71dcb84672a8c8bdd7 SHA-1: f5a8fcb1b63644ffe2c3ab25a78b0d991dd1d331 SHA-256: 642513607254971f10a241c6800432eaf6756bc0de9d89ad42074506fa75b92e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on compromised websites. One link specifically attempts to trick the user into downloading a web browser for Android, which is a common lure for phishing or malware distribution. The presence of embedded JavaScript and the nature of the links suggest the document is designed to lead the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=download+web+browser+for+android PDF link annotation
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea51ce4949---toxebimivijubusego.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/11203162524.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/97524143634.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410e2e3802d---51089363627.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131497e93985---66837220105.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/33058339626.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2e4621949---jumobuzote.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/fufifoxenoku.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pozujekoxajujinobenuwope.pdfIn PDF document text
    • http://iscelenie.info/files/file/bavimufijoxetog.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/74940124502.pdfIn PDF document text
    • https://premium-house.uz/images/file/takibemeremixazatawu.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109072109405359.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/22523472278.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/tosawivitogenige.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/80490141302.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/16088582322.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/81562070318.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/21083615981.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/56326522613.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/73044662367.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/13343729167.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1cb94d2d57117f603da24001fa2421ab/xitefib.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/nugofoweter.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_off0000bca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA0 15452 bytes
SHA-256: 409854745227cebf744c26c2001a9860ea674b81286290b042faf44b07fe7bca
font_01_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 10476 bytes
SHA-256: d68ffa52b7dd8edb711f523a27396cae572b19a42df7be31af39ecef68b972c2
font_02_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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