Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b8de3febbb517e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 18:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 25841853bd7dbdec73e763b94e8a7585 SHA-1: efac97e3c4afb003aec7faaa2489b067d13c8850 SHA-256: 04b8de3febbb517eb1d50524caacb99abb292e07f00140bf943da84782783002
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted hosting. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6684

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFException. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=how+to+spoof+my+location+on+android PDF link annotation
    • http://fullerton.kopanramen.com/uploads/files/1758447175.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/7586296293.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1cf61219---tefixoxenaxenorudux.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/12705493536.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/bikasewuzit.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210913155501.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mefizuvutuvutaxopuwiw.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210915150416.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/kakixol.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132e9755298b---degukiripuxuviku.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///63777117858.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/wukeguf.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/xanurigexakaruga.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gidevu.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/15355064257.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/78728383326.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/22182948632.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/2019290895.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/pedugekugusop.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109071300127353.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/mejelomonademibivavasa.pdfIn PDF document text
    • http://agilesolutions.in/uploads/4262587126.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/94156153529.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614202142b147---46973325841.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2167820a9---rusiwesodujeke.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/68689278275.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/27772828246.pdfIn PDF document text
    • http://anna-bel.com/app/webroot/files/userfiles/files/36785544988.pdfIn 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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 10840 bytes
SHA-256: 8edf4fedada8dfaa563c3cf4b8c39f5d1c0dd9d8064c5d409c914e0319051a67
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 18128 bytes
SHA-256: 17ff3db617c3c4dac9e6deadb9032dea6ce53c8da0d5ea78484ecefa4b4b4931
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1