Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7ec61b6d1261a1…

MALICIOUS

PDF

64.0 KB Created: 2021-08-18 22:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07adfdf88da1138cb51135edadc9e09c SHA-1: 04f49e8d7ba0bff568cbd44516f7e2a6eccb46a0 SHA-256: bb7ec61b6d1261a1624a501736be0247dfce09fba6b981bed19e5bdb1209847b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the file exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6906

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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d4786e23b8f56ebfe06b00b3be94173c/lujojejinoxopusunugi.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d5156f02---24887400945.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2461d4bd97---30363969942.pdf
    • http://ajk-opakowania.eu/upload/fck/file/60653744862.pdf
    • http://hourinkan.net/js/upload/files/15854643291.pdf
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/pabetutosanuwofijapobezew.pdf
    • http://www.rotudavid.com/ckfinder/userfiles/files/xalupowikizedoli.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6fa3cd16c---63980295135.pdf
    • http://imaginove.eu/data/Files/togefivokelawutojifejaw.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/dotuwexikaxikig.pdf
    • http://www.awakohchang.com/image/upload/File/9764050091.pdf
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/semosizinijuxe.pdf
    • http://agnieszkapawlik.com/userfiles/file/piguradojominomulatazo.pdf
    • https://celebicatering.com/upload/ckfinder/files/wifewig.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c864695e7---sapefuwinizebikazek.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/zidedujofesosewepevazez.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/475698a9e754c39c371ff6b3bc3c539e/fuviwefagakiva.pdf
    • http://lideparts.com/userfiles/file/1622421042.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1611516f8629df---gavumazefebazimijade.pdf
    • http://transfertrolley.cn/d/files/88520641366.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4a2f776e8d5aad31af411e9cd6a3c672/zakageraben.pdf
    • https://daotaolaixesontay.com/uploads/file/5596974622.pdf
    • https://intrigantka.ru/images/userfiles/file/nuwozi.pdf
    • http://enjoy.sk/editor_uploads/system/files/78414618644.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hangout+dialer+for+iphone
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 16792 bytes

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