Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a361bae32531375…

MALICIOUS

PDF

64.0 KB Created: 2021-09-19 12:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 949800449aab9e3364f68169b855b502 SHA-1: 79da0e96a4a5b4ee2c868f53661029c49cfcdc7b SHA-256: 8a361bae3253137543e880687d50994c5d3d5eb3b160b8b73d645e022265f5ec
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and the nature of the links suggest a phishing or malware distribution attempt, likely using the embedded JavaScript to facilitate the redirection or exploit. The primary goal appears to be directing users to download content, possibly malicious, by leveraging a link farm strategy.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3846

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://laborke.ru/uplcv?utm_term=gta+san+andreas+apk+download+compressed PDF link annotation
    • https://thai-airpark.com/ckfinder/userfiles/files/72173812092.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a9ddd875e57e0c99c5874e4367450748/29005902356.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/sumazubegopuvirelubesano.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/14142704604.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/zisuramodixowodutatezitag.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/bdijhljdnobjjntdhfaajf5m63/59770541103.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/11939144325.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/22827370546.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/zufezogakosazofu.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210904230355_1674742315.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/zutisi.pdfIn PDF document text
    • https://12tiga.com/contents/files/40103073317.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/lofekajun.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/gitizegexenusamiroladux.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/dojowiwumetasakoj.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210913230427.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/sisinijarobo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f65717051---14180686133.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/jopibebu.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/63249509994.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/59750975483.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/13009672365.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/96505191376.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/51380748245.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613130f47e7f5---gulen.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/kigobibibuduxufegebok.pdfIn PDF document text

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