Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfee1a7520917140…

MALICIOUS

PDF

90.4 KB Created: 2021-09-03 05:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66a8f11aebaa59a621191f1581c786fe SHA-1: 292b01cf82588a0e4bf7e8157579c2b5b45bee6e SHA-256: cfee1a752091714083681e18509ffb417545cd3ec3c1291f19e8e6ea6db31734
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.uc-kushiro.net/images/library/File/75784690983.pdf In PDF document text
    • http://designbeginnings.com/upload/file/luwis.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e3c94d4c544580c61f047c0f5373be8/65251813955.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4d930462a8d424c2fc89e66533ddb1a3/31023050160.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/j0slorbqk9jrrclfhb5kktntm4/41294569372.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/145812892460a1330c657fe.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4f8920a2fb302ff199616c4cf6f5d451/64540006468.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/7ce0b631a854ff17c0ed1927446e3f45/32330899200.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/33869590169.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074766ca44c2---58282575857.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d33b5148bcaba16c60ab0bfcd84b9a89/safobuvusu.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/voxobefurolik.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/tisawakabanitufasunalufa.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/13991708319.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/wurifenugir.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e28c8acc9f8fced39a242983fb88e8bc/mutimobumegilasufageza.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/1828317480.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/kewinevifowetawon.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1ccd97d9b54230197b77654aa37b5c13/pobowizawodajixejukuduzum.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/23353716191.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/400ec7f010903fa49776d693df6047ae/34781060059.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/21028639084.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/mitudesodobanajo.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/nokilofiko.pdfIn PDF document text
    • https://tcremich.lu/files/files/17331222044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=eldridge+cleaver+book+pdfPDF 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_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 10704 bytes
SHA-256: 9ffdf30b35206be439b5d6b27f1315cdd5fe9d233f5c102591011ce8dbd57a2a
font_01_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 17824 bytes
SHA-256: 73db4533ed1fae32ac3c46bf796bdbe962d9245068824098ff112190762cdf6a

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