Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e1b406b4a5f330…

MALICIOUS

PDF

91.2 KB Created: 2021-09-06 13:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b7a5ea6cee7ce5047e53b39a38b8acae SHA-1: 63edc5f7b1f5a0332a2c37553a97a865733e472e SHA-256: 24e1b406b4a5f33006d68ebe900717c0f33744ab524cd80f975e949a2c751b7b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://chcial.ru/uplcv?utm_term=3+levels+of+moral+dilemma+pdf PDF link annotation
    • http://btc-ltd.com/upload/file/85172769991.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1eaccb802b260f641a78a2eb27623f3e/ganuzopebeloloxufim.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b71c95ff---bozububafal.pdfIn PDF document text
    • https://atrax.hr/files/28356049774.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30734b6c1f---61589028640.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20216272241263281.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ba6bc02da15113c2fd24c63ad75058f/guwitum.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ddf29db048c9d6a2d8e5c46fa42803d6/vilipil.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/zigalekafojoxoketoboweli.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/1428895177.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8eba160c7---gugovekamozenubulagiterav.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f0570d2e---vudixu.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202108191851098886.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceea83f4f6---80167507196.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23521080251.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/16397250056.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/84052215497.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///mesuralasimaxupezabitun.pdfIn PDF document text
    • http://short-story.ru/upload/file/pipadewadekejexinolinutep.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/lewimorigiveduzomunuj.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/fibokovoxodim.pdfIn PDF document text
    • https://majubesar.org/contents//files/47291954506.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16127626e4f3db---tabogonu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5g2c0dajl81m098ie7j6ha0n7b/81676323644.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/9030619664.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/37688954165.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_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 18292 bytes
SHA-256: c82ce1381fef9371afefd9fd665efe29223e7aa4139c4b0bf0612cf17f2bb425
font_02_sfnt_off00014694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14694 10596 bytes
SHA-256: 155b89cf3fff7719da3190ffef161d5cb0d3d876596b2d3a938de026160c08f7

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