Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e1b4259f1806a0…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 09:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4a1bb6807b15f742607c9a1c273f760 SHA-1: a68463ec0c4a185abd5fcd26ca4d4bd61bf27866 SHA-256: 63e1b4259f1806a0de742048f9ef5542203aca4c8be4fd0d1c394edc4b94cba8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are identified as link farms pointing to potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovewusoz.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb1f260c1---vobaxefuxoguweresoladizol.pdf
    • http://fuku-zou.com/userfiles/file/41639877195.pdf
    • http://cdmvt.cz/sites/default/files/36309239749.pdf
    • https://hw-power.com/uploads/ckfiles/files/61482100cbf33.pdf
    • http://lnimeina.it/userfiles/files/11080961715.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/53317504758.pdf
    • https://ambient-interier.cz/files/files/82150631475.pdf
    • https://esperidiaogomes.com/userfiles/files/lizitabot.pdf
    • http://dobosugyvedkecskemet.hu/userfiles/file/kuripinetusuvulamazunufil.pdf
    • http://axiomestates.com/userfiles/file/97247711186.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613315f288154---55473543865.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132caa709985---xaperuwamokofedezetu.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/21987391609.pdf
    • http://kanomax-nsk.ru/images/zetimi.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161468e59d468d---68189706757.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144b3981aa3e---51338024426.pdf
    • https://arch.ua/ckfinder/userfiles/files/42579207363.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/fipubebigetofomasemi.pdf
    • http://aisne.proximeo.com/ckfinder/userfiles/files/vawixabe.pdf
    • https://grandhotelushba.com/userfiles/file/davusiporejewitin.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/72992876066.pdf
    • http://prmakeup.com/Image/files/pifodebuzulur.pdf
    • http://vyveva.eu/UserFiles/File/lugapajiwofekititavij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=knights+fight+2+honor+%26+glory+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b15e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB15E 16792 bytes
font_01_sfnt_off0000c970.bin
095767711cf956f3ce705e0531659311a0cd79e6fd89803b1103107320f8b2c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 15108 bytes
font_02_sfnt_off0000ef0e.bin
631c17a4be23523e335674edeea0cba95f16af29639db6165ddbf55d0f5765c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10264 bytes