Malicious PDF — malware analysis report

Static analysis result for SHA-256 105d1870c183e5bf…

MALICIOUS

PDF

97.1 KB Created: 2021-09-04 03:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30ae1b00fee871969c41dae23c7220d4 SHA-1: fbe7a0a324f0fc8b97488bf7a4da424f96a39b58 SHA-256: 105d1870c183e5bf7cbf7c5696229df3f14f04611bd48baf0901792cb7d89e14
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm for SEO manipulation or phishing. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://warungmimpishio2.com/contents//files/fodebujuka.pdf In PDF document text
    • http://bud-med.eu/userfiles/file/paminen.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kibelozizoxudav.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/94222246367.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/22670338922.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/5fb4be67f13bfe0be16d9c494daab260/38648694905.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8e43346020c39b1873d50f0c964f3acd/zalanedusisefavijafi.pdfIn PDF document text
    • https://andrejc.si/files/file/22336392421.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/85484645830.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aafcf4dd68---ziledepelejolawigedesabu.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/kudugiwufuvur.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/14692960846.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/55955300951.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff067a9c37---77962487773.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/xixewox.pdfIn PDF document text
    • http://clerus.hu/files/file/44024836254.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xowobubezewemevixoduvotid.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/8399b8e788ttbv10hmlgg40qo4/96196533480.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/19780992203.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607545e783a57---24375560696.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/31163475276.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/29080112998.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57abd9a3b4---wifal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+manual+pencil+sharpener+for+classroomPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 17924 bytes
SHA-256: 3b7cd2b1ec6a5baac32057f8772d1e3f462766d97b72e21c3a2c51dad402d1a6
font_01_sfnt_off00014574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14574 10900 bytes
SHA-256: 90662a81a8153cb9c2703d1b6759825254bb69586ea5b8c2bd602d3c4603ee90
font_02_sfnt_off00015e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.