Malicious PDF — malware analysis report

Static analysis result for SHA-256 feea03e9e3aadd74…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 06:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 312fde000340e8882d9fc90642af092b SHA-1: a6e19d0cb4a7690ddd6a40b315f9a24df42d8e05 SHA-256: feea03e9e3aadd740619d13205b67b75de2beaef71f40a02346a13a1ebb84515
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links to various websites, some of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ubestsports.com/imager/files/20210920103148.pdf In PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3147873399.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/39678527529.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/21039555941.pdfIn PDF document text
    • http://zgic.ru/!upload/files/33913398280.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613016d933e0f---98925670929.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450a7ea34e4---21062167512.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/86000161935.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/97984304241.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/vipigixunej.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/fojedusim.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/60910770080.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3aadc8dee---42983764672.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/pimoz.pdfIn PDF document text
    • http://npas.ru/pic/file/46309692431.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614376da264d7---21223885305.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/4541151898.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/maziva.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/boxogubivomapaki.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/45579991495.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/57293127323.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/jifexexepoduziduga.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/sogani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+all+game+ppssppPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 17196 bytes
SHA-256: 6efe966f044ba731b562816992ba266a080bd282bd05e8546e0fd6e9a18f129f
font_01_sfnt_off00010a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 10532 bytes
SHA-256: 1ec7d1c782f6e8b711bf1f9069a7fc1b89bad7d319a7052285b7f973429da73c
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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