Malicious PDF — malware analysis report

Static analysis result for SHA-256 6288d54dbfdeb844…

MALICIOUS

PDF

75.3 KB Created: 2021-10-09 10:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33100ab02cb92d9a0b16b70df58f7d38 SHA-1: d25a95dd13b50af4a53fe1c2b8397b6be160d9e1 SHA-256: 6288d54dbfdeb844d8717feaa909e1dfbf32e561bca7c908ee8c98f50416a3f7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=every+witch+way+season+5+episode+1 PDF link annotation
    • http://nyett.hk/uploads/news/files/85401591930.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/bujopodiju.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/afe0760dea139d422d41b92982edf212/doxutuwomewide.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qtvef50rscdht83qbbddhmjtr1/82889282775.pdfIn PDF document text
    • http://baoveantam.info/upload/files/27001072977.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/24204661640.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1777768671613b3b6cda931.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/vesefu.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/nukogopuped.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/49786542675.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/jivibumil.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1b15a93e---wagubosizerabusekeludenu.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/renamomim.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///bagowifurixudefisikeba.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/zidegutabavurotaxaveril.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/22703511295.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/43763458291.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/jabefasuzonotilu.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/dofozewigeposufi.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/87973347734.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/55518517873.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/malodoxaxefevapep.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161584b94c7bb1---58880425989.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/2021916055175902.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_off0000c12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 17072 bytes
SHA-256: a9b0dfd034b47b9d5b44f28d26443c030020ebfb41f5f3e89ba047ad34cace7e
font_01_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 11000 bytes
SHA-256: 002c45dbbe663069538a069eb48ca098f836b1877da00cb02aa0fe853ab823f6

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