Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a31393a482766e0…

MALICIOUS

PDF

73.8 KB Created: 2021-08-30 09:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13cecc0066d3c39481445b9c24b9d78d SHA-1: 4777d67f9b959cc5ed298c6b09eda6954f990420 SHA-256: 6a31393a482766e03b6da1e571e8b93e9f1217dcb9b2a60bf4cde1ee87c28499
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 WordPress sites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://elverum-revmatiker.no/images/file/wutuwis.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jowapaniramixobaja.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/rugojotojoselen.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/zedirukesowoxozapokokevop.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/3475702502.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/09dfc24913e163138c0145015063d547/57148387480.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e4c4f5ac---84889347998.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9550f782---kobagozemuziwozemopimesug.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff0b2bd564---panekekibogixop.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc86126148e---29556895921.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p19ofpcna7rf6vnpb2fb2l91kq/94973602882.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcb5c5006---xemakejadowimuv.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/64057620592.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/81927285468.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f92b13773b3f51e5cde80e49f524888d/27940809256.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f5d2c3386a4acb04134bf3bd65be4122/16631256060.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c66bdd24c918b3cfbc3b41a1a1a2c7e6/23722893726.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210731124757_2tdtvs.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/kuxojugimexala.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/dozudanoxebixaboruvuli.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/03c542fcce8acf391e7f579aed123ef5/56387748083.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/71538422556.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103e76d093a0---81967090877.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/11954777439.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e05862b69b---60941650542.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fbda617b9d7be7c1e7dfd7fa69a78c83/96919588712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=philippines+flag+color+codePDF 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://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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 10800 bytes
SHA-256: 4eb8a3e6df5866b5c90eff06897e5421c6acd7392bdfe495ff41f34f4d37fbaa
font_01_sfnt_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16820 bytes
SHA-256: 33a18c34b3f29aa99e29cbcbd0516b831d111d39eaaf66aa59612f8039b41281

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