Malicious PDF — malware analysis report

Static analysis result for SHA-256 a624636594f8535d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 13:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76c984a5db4e384ac29deb21eadd1aa8 SHA-1: de9d12aac5bbb0de3d44ac1a3dc9d69188ae7fb1 SHA-256: a624636594f8535d62c49b13503d801e0d19d57f2d7e5929ea21fccd80e69bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms points towards a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • 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 https://pixomot.ru/uplcv?utm_term=samsung+j7+firmware+file+download PDF link annotation
    • http://mweb.cz/images/file/86844637949.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/26863429822.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/71853218989.pdfIn PDF document text
    • https://viceda.com/userfiles/file/20991977336.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109230221484139.pdfIn PDF document text
    • http://computerdoki.hu/user/file/53853519528.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/kipawafaxitusiz.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/28964297392.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/10133073770.pdfIn PDF document text
    • https://haidangpc.com/contents/files/jininebeja.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/47553265631.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/lumirijomirilezawibakox.pdfIn PDF document text
    • https://kueapem.com/contents/files/visevisegegisa.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/64468212220.pdfIn PDF document text
    • http://watch62.ru/files/files/bulemaxonirez.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be2823662a---xekoz.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/fogosokig.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/jesolitabivifubisumizatu.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/pepakoxuwixubanevel.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/65138581976.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386e976560e---rawekuwuzulopegu.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/9307565621.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/bozewumitalazemijowi.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/xowutozosina.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/52510053024.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e41234349c---lulajube.pdfIn PDF document text
    • 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_off0000b65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65E 16188 bytes
SHA-256: 06c1b08840e9f72a8f3b735af5ffa186e5df7276f66ae96d1ae55319682302c3
font_01_sfnt_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AC 11040 bytes
SHA-256: 184396123ab87d93cd1e3b1f22d9172768a61fb93f22892ae84ae7075ae88316

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