Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9b359a98b2e68b…

MALICIOUS

PDF

74.1 KB Created: 2021-08-15 10:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84602f9673430941a746d9873d173447 SHA-1: 335a360bf0b2319952b57ef65103015974319fd2 SHA-256: 9b9b359a98b2e68b09fbe3c180ec97bc1328cbbfed7b5600cfdeaf4032651a40
132 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 redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3117

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 http://biosite.ru/images/news/file/sutapuvewizawamuf.pdf In PDF document text
    • http://jjburgerut.com/uploads/files/81691038748.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872e28b1d0f---pafozivofemasigaxid.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/77085050020.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/jomamivegaxatofuxat.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607611e8ee207---genivibat.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4b967t6n7nq1rvgo49pob8hfq3/5015030515.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2e3a03bd0e5b2b278abea1c834486b0f/guwunimodiluvunux.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/85149721549.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c886aaaae56---63210329355.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/fipagezagobogapumuxofif.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/mopikipikutafixuziwakosi.pdfIn PDF document text
    • https://arerp.kr/data/file///pisanejilojozulonid.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ae48476a30e0cdd0fa810f935af59900/46335382001.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/pupodokijip.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43c32675e---tekepavobemi.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/kokapulujodetiro.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/tugagofipe.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/nisosopexivomule.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/25f08e5338ae517fe4a7306f62b585a2/sulovigujasupawo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f1cc5c846---tikunidojeged.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59009621154.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5290f4b7b6555c7656e39f2b1c5cd48c/dexujoxejojan.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fuvevunidor.pdfIn PDF document text
    • https://network-italia.it/file/37909124611.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/notufepipapemavir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what%27s+a+missed+voice+call+on+whatsappPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 16872 bytes
SHA-256: 6e3dd7b2e4afb22d7afa1fabb32adfef5139831bda03ecf4cd0ed90cafaeabe0