Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e13364f4a50bf52…

MALICIOUS

PDF

83.0 KB Created: 2021-08-27 12:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a874b26afaad51c7fc89cbcbe94d67e6 SHA-1: d69771be86abc23354db6fff565c04cc8239dc64 SHA-256: 3e13364f4a50bf523e422c7fc4473ec27511b8552d16cf3ca813ffab5945000d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing or malware. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://sjalikave.hu/pictures/file/79966487322.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/51dbbffd1c3787ea8926b00f66ed87a9/sedojezikopebituge.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f1f2d7bc2---zuderejidisidekowevenor.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d840e60d5---75465567404.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/fivit.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9324623db1c96722f8671085475a3eff/wopewugavenux.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f131c502ca7---tavipemoz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284ad4990d---wumoxadogagubofedug.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/5aa7149a98a8d0326fa5ba82ba893ca6/lasonojizexepojepil.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/zefumukejaropeduvi.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/kuxofu.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/mekezibewitosarobumexike.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c771a38e10---65732670228.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/94002627288.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/g5np6f71bs4qf93aqhb3girbnt/12169168294.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hochrovk49co9vvl369jtr2ja6/mivovegiwukojowawufidebez.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160730fe508d01---wewepuxasolemevomola.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8d015a20755f8ab96204d83475e05d56/kububewisutozuwoluf.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9148899a1e7cd37abe239fe92a652415/vimajumudufiru.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/1841052068.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/seliwolodefezakutez.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161282fe71825f---fiwupo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6te8iutoqd3ill9dp1kfs7kb0o/reladapibodowatixul.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc2c776efd8ec579399437fe10781616/26727030795.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec25732246---bovoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+pinball+of+the+deadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 2736 bytes
SHA-256: 4deabf3bc238d40e3d8f67eefb757d5174969f93f932472d413d857f4b273b5e
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 16904 bytes
SHA-256: 218408165d1a6b57c3143d3bfe258683f8c3122f3e421808eb04518c6216a966
font_02_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12646 10428 bytes
SHA-256: 14b7a54274c4e9e63cbc3818602f8244cf9247ce33e88b3bb6e821ffb34388b2

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