Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e272ac7b5400df…

MALICIOUS

PDF

87.6 KB Created: 2021-08-13 21:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2f27f4659e817a160660ecfe580a382 SHA-1: b322a04688575373ef81fdf11efe70f67c693f6a SHA-256: 83e272ac7b5400df39772e102406fa05352e2de9fe380b10887304ab444363a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, likely intended to host phishing pages or further malicious content. The presence of numerous external URIs and the compromised CMS upload links strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=como+hacer+cuadricula+de+perspectiva+en+illustrator PDF link annotation
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b583ec0c---zopelokojajavukunafofilar.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/19368327341.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/m6rnv55nkdlbg139dh076ld1gc/34421381365.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a215b87b10b---xopexi.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/petenefoxow.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee79b0a5afd---jefixelonasaputobaj.pdfIn PDF document text
    • http://atek-ent.com/upload/file/19012417061.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/deduzofax.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/1473132234.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/sazinixeverubiruz.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/fubusesagabukuxepa.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916f0926e72---34132144689.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/60ktcviajuaeebcm9tl9jmksbl/19459352600.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/tokajoxifelewidalisuloned.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c052b557a36---78212262976.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/ce304864f8770c7c35cd7d5df2744120/ruzitasukokafivinerosif.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/wutujukigut.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/4009794757.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd3d4b4c61---jezitit.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b82f39578---55256956830.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096293a8d42c---vidokoxesov.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/87333d7bd320e69ccc986ad2e616878f/bejupububujova.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/vanadosufaxife.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10976 bytes
SHA-256: df956cfdb6e28b3252bd65d845d650a3ae25dda16cdb9069f9bf01251946b91a
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 17324 bytes
SHA-256: 69e9cf1ca64628863aacd1cbb3276b28db49fad5b575d8df2b8ade6d72d39046
font_02_sfnt_off00013678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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