Malicious PDF — malware analysis report

Static analysis result for SHA-256 e141c65325eb7324…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 18:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c4df45eae729dc355deb443dcec868a SHA-1: 4a7c65202c33a24b9acd0f6571eda5b9f15d1fd2 SHA-256: e141c65325eb73248e8068584efd24cca9f57758be9b4d85476adb73a2341678
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=dinamalar+trichy+today+news+paper+pdf PDF link annotation
    • http://ya-ke.cn/admin/upload/xizipavekefulorusadipo.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/68066640580.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/90702749683.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a8a4ae5aaee8b9471f6b56054cebc670/zerapijaxiva.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/sazuburafoneboxe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815490bbd70---jidonipixekopafuwewivot.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/91837248.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/80597555756.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a898838da76---forez.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/jekatobeguweravedimite.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fironekazoma.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/rulawusajepojabanokasol.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610890ec751d5---kokoko.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/b3a3fcqcnsnilliut4odj1gqk6/zilut.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210619162507512617419.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/61093041285.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/viwam.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/91058208696.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/58432808585.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/73d75d6a842f5586e7bdbcd4d306a057/57487944617.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/74222568030.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/tuzakowizukabirov.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4db75853---kiwonerewusefatijiv.pdfIn PDF document text
    • http://abroadster.com/files/komimakibiref.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 16244 bytes
SHA-256: f74afd43c04b882caf2cf4abe35f4f287291876a5effbe79c277cf827c8612e5
font_02_sfnt_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 11088 bytes
SHA-256: dc169090e89c006bb9f5d2d1d5b2a63633b7690c6c0f29ab4c7ffde0cb93e800
font_03_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 18688 bytes
SHA-256: 9bde872a207d27ab8f840132cab0ea427fe5b0ff851a68a9700b4dd6b6138edf

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