Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba6a5774cf50f27…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 06:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bcd8b01b6fe837d2735d2a06ca938da0 SHA-1: 13f46c857686741f2246123216f313f3bf73968c SHA-256: 0ba6a5774cf50f278145d26826e77376644b463598ff41416b3855a28b680f02
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF containing a link farm, with multiple heuristics indicating it points to compromised or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. Although no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users to malicious sites, hence T1059.007 is included. The primary attack pattern is likely spearphishing via attachment (T1566.001) to lure victims to these external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3734

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 http://csc020.com/userfiles/file/20210905014403_kht3ws.pdf In PDF document text
    • https://ghnservizi.com/file/soxasasaju.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/15185117086.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613adcfa33a5f---30335121617.pdfIn PDF document text
    • https://maria-galland.ru/files/file/28369911862.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/xipibodexefivivivelubo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6abc37111---87086100006.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/pigebazudavubuzuvofom.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/2074069300.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fuzabebejugepomu.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/kapelixifamow.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/5874103770.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/nexedix.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/wudukikomadu.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/tizozogexodokopubokagesof.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f3ede80d---49456206983.pdfIn PDF document text
    • http://chongros.com/userData/board/file/fimez.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/kanegazolopugawiz.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/94630156812.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/41600864756.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/90983794954.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f26726fb7---xigoxaferiresawifezulos.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d785eacf398d98054b605f45cf5df0d4/57171810192.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/jilugimosifujexudepuki.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/zofuvakuvejokokagazufami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=index+of+modern+family+season+6PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 10752 bytes
SHA-256: 372fc479523369d30b863304f37b9bffb711e4a03e1cad4667965ef0c60052f8
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 18004 bytes
SHA-256: 25c9f13402e353ce4ed43c0e4270d6a78f762136943c59b119f7080b2b20d1e7
font_02_sfnt_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1