Malicious PDF — malware analysis report

Static analysis result for SHA-256 684ea298a9ee3b0c…

MALICIOUS

PDF

89.0 KB Created: 2021-09-03 13:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1d726aa05a33816ac0cb57818e3bb3d SHA-1: 8f743a9457bc057f7a86c2ac57b58eb60ed6e9f3 SHA-256: 684ea298a9ee3b0c02b539bb7381aa78bde23ef115cfa7473836f52e8f3a6235
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting. Heuristics indicate a link farm and a deceptive download button, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload via the embedded JavaScript or the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=reasoning+questions+for+ntpc+exam+pdf PDF link annotation
    • https://pichsas.com/file/dirutojinabe.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/97480674625.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vuzonepivub.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/hd2srv0ufro3l4551n18r540hu/74870374812.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/11280651991.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea56d1ce99c6c7684afce484c776026b/tudunexisujasipemi.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/4222171083.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/kizobe.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/naxinituwugu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeadec3dc42---ropubasu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/89978695907.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb0fe232f---birugawipebowebepaw.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b2f7b1da46848c6f3e1843b71ce69c6/tavedunegamutibukazukivi.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/xolupugazuzitekef.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/vewibogonikiv.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/21072377333.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/bojivopojuralokixot.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1dea11af6---16896368001.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/doxevaridixefuroxerezavid.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/91v6ii6cb93t8urrq7tttnjjii/kobuxuribaxelun.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/28567492340.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc126fae5---fenexigovogolikenufawiwiw.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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 11312 bytes
SHA-256: cbbb6047da5c97a819b3753bafbbaaa9bb0a9c9170b9e8a52574352cc67f7c90
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 21048 bytes
SHA-256: 966edbf3750483fb3a2190a0bae685b867fe32bf61793af0caa7b12ca43c5742
font_02_sfnt_off00013e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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