Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76b1034b881e3f2…

MALICIOUS

PDF

81.6 KB Created: 2021-10-12 03:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1ecf6dd42a2c7ef59544872709b36b42 SHA-1: a2c0ba0a30a910793e11f7b19496fd0224759189 SHA-256: c76b1034b881e3f2aca1fc46026e8ba6ee9c40fef5d099ab8ff9a74e77ee3a86
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of external URI links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ecosolar-energy.com/piceditor/file/40067743216.pdf In PDF document text
    • https://rajatotogroup3.com/contents/files/jepujowame.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/19479383202.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vhjr47hflftkd5asqmg9rlek50/6423838626.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/27948046785.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/71736108004.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/dakezuno.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/26255050031.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/sanas.pdfIn PDF document text
    • http://deauville.ru/files/file/doxumofagufojegugit.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/kozokisakupeja.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/42226721904.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sozatomureresatomimoxev.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/44812925290.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/kutugolutak.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/gidiv.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/rorugolujudevi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163cdc0d7125---70777276328.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/99260665549.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/29137416529.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/nijevotajabodedidowedewij.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/8639937359.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5f1c15a99c9cd243f2d543596915e4a9/wubowipuluxosasejapizul.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/66867938727.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/39441414917.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xoredorafuruwuzolasivogam.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/80095170598.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/jujufera.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=the+sword+of+the+spirit+scripturePDF link annotation
    • 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 17852 bytes
SHA-256: 0925894a7c20d04983c207d3ee0c3986bb4b20e020170d4f4414486d6955578c
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10556 bytes
SHA-256: 69d07e8e58dbd449e2ddf0c15a7c87c322da005058030df24bb5dd9690879fb6
font_02_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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