Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd13eea3b03688a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 00:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92b94ecef4eec1d4adfaea51c6b37150 SHA-1: 60736cef5a7528be94363176c6b357cbee2cbc92 SHA-256: 6fd13eea3b03688a2a5420df3261e9685914924a9c11f43fdef09ca227b501cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. While no scripts were directly extracted, the PDF structure and URL patterns indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://namngonviet.vn/user-/files/12569128424.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210903214650328.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/bumadugobuwesupifun.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/14488785533.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/pufilidudanedexexekate.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/bekiz.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161409368602df---lasuxaz.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/86087426475.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/v8clbp5iv7nhsi5fd88qit9cdb/zawudoxuv.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/pevesuxivodojukabiguvafiz.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090905364873499.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/47357358551.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-5/20210905134822266818.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/zovovodame.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/kejanutato.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/76a2f1854404f0f25f8d878a15d3a07a/jalonedidid.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614009c3034ea---95911203787.pdfIn PDF document text
    • http://artediapharma.com/upload/files/38204610130.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f16f092eef---70107671655.pdfIn PDF document text
    • https://kimcert.org/E/file/balifegilufikazube.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/pugafuxewugobabisur.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/rigowuzubogoladesuje.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/lijodorijavavokimetevuxox.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/ruxaresijutubuwijujufona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=windows+7+iso+file+download+free+full+version+2020PDF 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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 10784 bytes
SHA-256: 7036d85aafdd3a1805744134e4538bb77357e0c19749024931577cb98474da6f
font_02_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 16308 bytes
SHA-256: d6a269485abcf8d53e003c69cee8b52e7eb767eb487dce1905f7205c54107b65

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