Malicious PDF — malware analysis report

Static analysis result for SHA-256 4201e0f65c55e8a5…

MALICIOUS

PDF

92.0 KB Created: 2021-07-04 22:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bf488cd1ccc651573d6469732eb3812 SHA-1: 44eb14e197e7fcb838ec39dc7b8f7d95c7f671a0 SHA-256: 4201e0f65c55e8a5c0478b9763bb75075c5b02949f69e0989bd54a9c6d8942b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage compromised infrastructure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160948483de1b5---zeseve.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7c14bff8e---gutoworujibinegibup.pdf
    • http://liccuza.ro/stiri_files/file/pazegomefupimuj.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be929c2a45---wiregevi.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d367cb5fa---riragivujipupedosisifadek.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ure66f9f7jb6ciiicieu1n2t47/juwewilidejekujowi.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b09fbc97c8b---tomujavej.pdf
    • https://muratay.nl/userfiles/file/35205075370.pdf
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/20407144314.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73e091de44---65820395576.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccba844ac3---64493325475.pdf
    • http://sosnovgeo.ru/userfiles/file/46944388422.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855182e17b1---laputakabijiko.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7523f3e8c---89958433087.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1939d495---72133923681.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1gpm0kf4shv60nlnbhqtdnath2/19286606271.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089a957431bf---76931460265.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19726acf9---28888889712.pdf
    • https://alzubidi.com/userfiles/files/fobinefafi.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/05df84c8a51b3e88dc3588a351a43665/63255020067.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bf7d5d02---xibiwurafax.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608b593ac3d5a---67416834147.pdf
    • http://zkojicin.cz/userfiles/file/xikufetin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=two+parallelograms+on+the+same+base
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7a.bin
5ef105d66d99bddfffc8eae27bc455f0fb292199e7eba6d12e90ca33cb45f34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 16284 bytes
font_01_sfnt_off0001007e.bin
832c9511baf3f5f065eb7d46d126ec4867ee72081bf8f927f372801152794945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 10796 bytes
font_02_sfnt_off0001190b.bin
76ded3fc42e8aa6c249377d110a5a47238e9dc6351568077bb1ea2d2a3f39274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 18464 bytes
font_03_sfnt_off000148b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 16792 bytes

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