Malicious PDF — malware analysis report

Static analysis result for SHA-256 47251ca52777424b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 01:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ceca600fb4f3203b60a405f376472e46 SHA-1: 465e1a480211195444c98a28dc7fce8c9227b3a5 SHA-256: 47251ca52777424ba5e280cb589b6ea8249f3010b2a5f13870197560a040739f
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 a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609487507dce9---kinamanuzuxuronajasud.pdf In PDF document text
    • https://equator-maritime.com/userfiles/file/fefujodonotekonikopejozi.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/24494450545.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/78660487334.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3087c859c7---xegoregugodaven.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/muwobu.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3544b248b---bizunapalogeg.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e04c288f---14077307703.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/piwizazukepafujilimapev.pdfIn PDF document text
    • http://goldmustang.ru/files/files/bibaz.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/xuvavasa.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/97351576748.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782c6592b5a---43626411082.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091c12bd3f90---xemotezotivetizu.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/gifewipexovobotugokegobof.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acf8dbcaf6e---lodizodazegezenatal.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/6253052484.pdfIn PDF document text
    • http://hzqzg.com/d/files/36475612899.pdfIn PDF document text
    • http://millecolori.it/images/file/kepisaxu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/i0t2vaso98fbqn8iredf0ks8n6/47105568908.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a905ec52e---79085786932.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/45208912780.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/65951773387.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/tifetisoronumib.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/sanevuzosibijegagifiguk.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/berijofare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=healthy+people+2020+objectives+for+older+adultsPDF 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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 11396 bytes
SHA-256: ecbde6fbb6bf147456dae8d119d923246e25506deaf7ace035c638bf14ca9df0
font_01_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 16912 bytes
SHA-256: 18cf01f548ebd9c092da7e0fa185b4db1d8903ef1811006752cc51db7129c3de
font_02_sfnt_off000122bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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