Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcf5e1ccb12e412…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 12:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 477d682c70ea1aca49f5edf4196f1cf3 SHA-1: d0add1add293baf9586abf1b06ddfe844c50346a SHA-256: cdcf5e1ccb12e412486cd70f5473904a139e965d4d44a734cbab6b6ad1c96386
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics suggest potential for JavaScript execution or exploitation to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6693

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://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/59496533369.pdf In PDF document text
    • http://agro-partner.com/Image/files/rugizebenoveju.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/defixiwufetalorulujak.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/vebemolegok.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/42675773863.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forewajefavuwodukobabu.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/19010792936.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c59gl3lf2bcfh2b2m1aqcaukd1/malupamixula.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339b7c1d906---44713384823.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/seziwugojawolo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fed26c0e3edcc552e662a1719f47fefb/66296073762.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/65509132667.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/75095596703.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9fb0aa843c9a532503e969c2c5b09ad0/37527015392.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cde235f29935d72674f46226ad6bab21/75269874614.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/xovosofigubozilo.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/42827618340.pdfIn PDF document text
    • http://lulanjina.net/upload/files/36395950083.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/41338191455.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/64234286700.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2012ee53644f068ba2061004d91cd5f6/vumudur.pdfIn PDF document text
    • http://snft.ro/media/file/jidadako.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/woseromubade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+san+andreas+stunt+plane+cheatPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1