Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cb9abb6a174345…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 16:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7cb990b8067be988ee46ace866b6563 SHA-1: 614a336a8909df6bb3aff5aecf50fb8f5b7efe33 SHA-256: e6cb9abb6a17434594797e2b6def3bd7c7fc8d262fb73254d47f3f88794da6d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic firings, particularly 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM', strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://krisoc.ru/uplcv?utm_term=sex+games+free+download+android PDF link annotation
    • https://olterus.org/contents/files/1583076144.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/niroxinolekoxol.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210922183759.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/2737927403.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/roxefuk.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16145a38936a02---likomofuzan.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/16772631383.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613248925b584---kenosugejigufasibit.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/bozazepejipavufojitejeka.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/88471997246.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/28982116373.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/99507013998.pdfIn PDF document text
    • https://cncunse.com/d/files/xawujoluvokudevow.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/pejap.pdfIn PDF document text
    • https://griffithnorthsideapartments.com/ckfinder/userfiles/files/94121188470.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613940b9677b3---78201521400.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/maparifikuw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b925982232---83461624474.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sjrm2rv3ek2omgqe0tevoo0ml7/kexiguxuv.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/mapenexemizali.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/78688448589.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/fodafe.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/82013117552.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2ccab42ca65220a5a60f0e6d5c2fddaf/fexezexifolijajuwalu.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/64315488996.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/95600593071.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/20527968118.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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 14352 bytes
SHA-256: 31b4f7765305bdbce900a27089665c094b4f93e2f57d007ea2e77efa76bf6c8a
font_02_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 10860 bytes
SHA-256: 878a442a14e5f0d00f51bcb3c53f35b0f1dd726485886feb73ed885092954edf

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