Malicious PDF — malware analysis report

Static analysis result for SHA-256 e078f33d145a6e05…

MALICIOUS

PDF

74.9 KB Created: 2021-08-30 09:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9119bf13f6ccf0c32963b72afe0a43a SHA-1: 95720e177b05768194e79d159413ded284b5ad3a SHA-256: e078f33d145a6e0562df567c529dafdf42f285c0d40df84fbe3eea36eaf72a1a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure itself is also noted for containing duplicate objects, which can sometimes be used to obscure malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://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_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