Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8896de6f6d6945e…

MALICIOUS

PDF

89.5 KB Created: 2021-09-21 00:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81015f468c8f4dc038b478bd33b5cb0a SHA-1: 08b1d027bfb44d4aff9a1eccd7257a4b66a96a4c SHA-256: e8896de6f6d6945e700a7fc1f0ce8e938b8c59a4ba99b0f2bb5d5d186b2d0d5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to obscure malicious destinations. The presence of embedded JavaScript, flagged by heuristics and ML classifiers, indicates potential for malicious code execution. ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462903f40e2---doziboret.pdf
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/18524931192.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5c8db064---mogidom.pdf
    • http://veganogle.es/uploads/ckfinder/files/42980881691.pdf
    • http://akademibt.com/resimler/files/10986254558.pdf
    • http://sjatupornservices.com/file_media/file_image/file/wojurikakuboj.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fad147ae3---52335273998.pdf
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/3056942846.pdf
    • https://fceresources.com/ckfinder/userfiles/files/gapavaxenedurur.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dd852b616076d85adeddebe1f19b7cb6/53305467679.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3863260c18e1ac442e7520899a1586a0/ziwizoj.pdf
    • http://xnucleus.com/members/member_images/files/55451476936.pdf
    • http://studiolauramoschini.it/userfiles/files/xopefekebobudumuki.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b8c086bb13ba312a6cb2130765fb16a2/bexeberowulewema.pdf
    • http://studioarchoggianiepartners.it/userfiles/files/48978059872.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/4453289550.pdf
    • https://braindevelopmentmaps.org/userfiles/files/besegutub.pdf
    • http://villkasz.hu/editor_up/5043684990.pdf
    • https://zohopinler.com/calisma2/files/uploads/powugado.pdf
    • https://jagamimpi.info/contents/files/fupakozapifaxogesenug.pdf
    • http://vbond.hk/editor_upload/file/xufepirirolovifemu.pdf
    • http://gesundezellen.de/neu/userfiles/file/segurinerujufewojuwafefi.pdf
    • http://abwingsva.com/uploads/files/17806703707.pdf
    • http://seoulgreeter.com/userData/board/file/xuviwudijifuxulu.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/77466265416.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/pimudabiwumuguxejekix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=darryl+darby+son+in+law+novel+pdf
    • 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_off0000fa0d.bin
447d8a4f78905917f015ad7989e6bc616d23cc5cebeb68aa1dbc097971b0184b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 17776 bytes
font_01_sfnt_off000127a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 16792 bytes
font_02_sfnt_off00013fbb.bin
564f1b6de04110fa77f0fdde70df70d6e2e342d81af014f3ff348a199612c772
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBB 10800 bytes