Malicious PDF — malware analysis report

Static analysis result for SHA-256 967fa92556c7d291…

MALICIOUS

PDF

70.2 KB Created: 2021-09-10 20:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b69ae59ae3c52d085eca2755733b53e SHA-1: 2bea4709f93df716e8ad8c5fa19cbfe4a924cbb0 SHA-256: 967fa92556c7d291002f1e7996d7a0e541ffadfef589c7ea84b98944c1fbc9c9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to compromised WordPress upload directories, suggesting an effort to disguise malicious links. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7455

Heuristics 5

  • 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
  • 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://crewmak.ru/uplcv?utm_term=jak+napisa%C4%87+aplikacj%C4%99+na+androida+w+javie PDF link annotation
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a34d7ac---riletulifegigetewug.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910124856664853.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/kasomurulajejirop.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/murinebenevobosudewefuli.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/92345734152.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/meresuvirexope.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210906141315_822081163.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/69736900788.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253ef03d3a---77215423782.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/zefixezadewabese.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/82295581308.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/faruxaxowujojojesotivin.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/83047706253.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/64172973598.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lojipukepagowuvoguker.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93dd17405---busejelev.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/95045996032.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161320b40488db---10214796707.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/73441278203.pdfIn PDF document text
    • https://menu2uplus.com/images/file/614798406.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ac4d9ce0---74527681003.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/64089026429.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/misumuve.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/44744418875.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 11120 bytes
SHA-256: 1665315efce25200f0ada50f7335a922503a1972042ccf666a1809fbc3482555
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 17804 bytes
SHA-256: a7be0ac4660eb72263476d5bb463a3012f61cbf36c8396615344d9188a1ceb3f

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