Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fba14fc191fd341…

MALICIOUS

PDF

70.6 KB Created: 2021-09-11 04:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1964ce5637b6b105646f36ec4720daec SHA-1: 9874ec03f6e3217c3fd85acc45530f955b4e80e5 SHA-256: 8fba14fc191fd3416bf633e4fd97deac0c13ac004943f38fea9daf2e23fb7018
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware delivery site. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sq1581r4gh1j93eie5bvviof5c/30697062608.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kutot56jd0qm58mvg1e9n8tns5/93941637110.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/gusinusewozokamo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa84bcafb6---15052925205.pdfIn PDF document text
    • https://everestart.com/images/stories/file/37300549551.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/87192120611.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/73067500937.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/13784102629.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e46c12891---40513623254.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/aaa6353315f81d166d2f09f7ad37b858/4145012951.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/75903521630.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/mevunegowororosijafipi.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/zilixawixebaripojupoga.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/23755166833.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mr6i790mtllp7hp9caadmqh4d2/24065013065.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/gazukarijibesiwoka.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6b25b565b330c91bff70f827665fd7c1/sojamu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47543843128.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/9455981369.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qd1isjpppij8s8q2dpmbq3m1m0/10787888093.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/fexebegojewiramesuwapeku.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/joweteborexavev.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/giwuxuv.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/vinor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+amazing+spider+man+ppssppPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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