Malicious PDF — malware analysis report

Static analysis result for SHA-256 0783955a83784cd2…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 03:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 20166218f01ca95c83c571d28994416e SHA-1: f9f7c366e57f7ea7d2bb5de7fd7b3a98ba1f6384 SHA-256: 0783955a83784cd2e317183a482271ff6ba89fff0308b7178c05fee5e0d85b99
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7289

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://ketchas.ru/uplcv?utm_term=fear+the+walking+dead+6x6 PDF link annotation
    • http://dancephoto.ru/userfiles/files/kiraseresoremof.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/lunurefen.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/6950845160.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/vibit.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/58857677195.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/dedopidovax.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/70302857560.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/luluvejorolizixoximolezi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1h17unnnhjejgco5vd8f652ef5/wuxomebukadape.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/25970110116.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/4088833188.pdfIn PDF document text
    • https://5udua.com/contents/files/55443292500.pdfIn PDF document text
    • http://sdes.in/uploads/99148595608.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/18265213872.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130822709740---fotewanirudem.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/zurikufaruximoxuk.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/feruji.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/35530211664.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1185149f6f9dd4aa1e9d60db1f56cd02/jagikinu.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/50507515040.pdfIn PDF document text
    • 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_off000146cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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