Malicious PDF — malware analysis report

Static analysis result for SHA-256 473bfaebfc272f45…

MALICIOUS

PDF

75.6 KB Created: 2021-06-18 16:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 163e3dae9c564312e51ef84a633b8c7a SHA-1: ef384bb9b4fe3eba1398f04ff69c20895baceb2e SHA-256: 473bfaebfc272f455d9aae577f9ead461fc6d6945590d9dcb72f1b11767c3ced
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://synerhu.ru/uplcv?utm_term=passive+form+english+grammar
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7abe05cba---2465957379.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dc4d48e6f---96550296525.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/7307856e015ae2671739ce31104d33b6/naxawolipigupetiza.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c101750d1f5---91815123702.pdf
    • https://walkandsmile.com/userfiles/file/famekodozoxa.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1d496abe53ffc201f4612aeca10a5b03/jazabele.pdf
    • http://centralgiving.com/media/userfiles/file/19707026551.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4d2877fc0da81e3f1496cb242569f3c4/fojakaxitojufitapop.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc51d24604---78039811437.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/oh64tuq0bgdbcurrar0kmfmm1b/gizoradobureb.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8418874ee143220d83f348dc7cee3c55/14220171348.pdf
    • https://alexandrapanayotou.com/web/images/static/file/wepupagupefobosedej.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/l4p7a6mcl0patqo8ol6g3v3faj/35324954717.pdf
    • http://cuboni.com/uploadfile/hong202106101412546721.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076145187364---jaxajovibibukodujimiraxu.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0f7a2b8c---sedifasevaju.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/78601b2f6e19e3ea23622f3828104fc6/21745177902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010923.bin
3b55bbdeb64619e0252e7cd279d419f273493e5ada2dd8ba36b6244ea0081ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 5240 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.