Malicious PDF — malware analysis report

Static analysis result for SHA-256 824c01418d7cbc23…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 08:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f91785d83f72ff86c8a1227a1d10b0f0 SHA-1: 0a6d97b9a1463ce131c25937ce8d82aec916e2d1 SHA-256: 824c01418d7cbc23579751c5455282a64db4e56bfe4921c08fab8904d3b5e46c
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a browser extension or update. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://inwebjor.ru/uplcv?utm_term=how+do+you+get+free+robux+for+real PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134083a26d43---sumodosifitawipor.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210906_113634.pdfIn PDF document text
    • https://digireg.cz/upload/roxexozo.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/38777079128.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/perukiwaz.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614415d44b632---wigupan.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/10083923181.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/mewisubatuvoletunoviguke.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/mutotowisijatesoz.pdfIn PDF document text
    • https://majubesar.net/contents/files/84648517832.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/xopakenivokivu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614166f3d4adf---63515270362.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/53141040293.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/pamojegizewibakag.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/22716840850.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/87969233112.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/34280875775.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/85611596968.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigevejel.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/bebepujivuxubi.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/wuruziburine.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f294edc23---33694520289.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/xilinexuvokofu.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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 10696 bytes
SHA-256: 1ad9a754a261bc96758fab14b0c7be3c2d33fd0a97313a5bfbfff6a3b6972afb
font_02_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 17744 bytes
SHA-256: 4d122269288d6444712947a7332500906c2d0a66a5650072ac820952ef561ae6

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