Malicious PDF — malware analysis report

Static analysis result for SHA-256 916e4eeef4e17024…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 01:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dbe791a897a9583316ee67489e16922e SHA-1: 869b04ed85423e11c3b773cc6a90fd1c2d615cc5 SHA-256: 916e4eeef4e1702466a151f268b7061c3e5bfa5498b3bdc04fbc9ae65890a8a4
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's primary function is to act as a link farm, likely to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5631

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gomazalijap.pdf In PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/levijiwidexawata.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078db2e89d8a---fumesamosesed.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6668a31cdd---marerutawegiwoveva.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280029338395.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/99242299975.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/kizaza.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/89903169865.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/mipenerukiru.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b864d30e4fb---45306568425.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/nobodelalirimaxulefeduv.pdfIn PDF document text
    • http://aweibel.com/Photo/file/rugaxozovegeloxivi.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/74732206492.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/bekavulanoku.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/tiket.pdfIn PDF document text
    • https://purefeeling8.com/data/file/67771638121.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/8orbc53hq6nqg5s5cjgssj9ifn/83035643018.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607859f857568---wukamawibid.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/murejejumeguput.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/57238341838.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/65282571679.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/penid.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/zelerisotoworiviwolin.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/36885996390.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/49755059673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cooking+previously+frozen+lobster+tailsPDF link annotation
    • 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_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 11136 bytes
SHA-256: 8517d465c367c8606600120891211cfa179b79abdd36688a2bb8c26ae0b4022b