Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cdb01736f06001…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 03:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08fa4427d9defdc1c24d8edd8426fba4 SHA-1: f1ec4cf5693dd100e2d182cea9670c7f7371a33e SHA-256: 10cdb01736f06001fdfc1dc99b4056e0a8ac212a42be2ef28389c2f34975640c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2089ecf4cab5d468f769d56b9c72f725/wofabenigofajexido.pdf In PDF document text
    • https://tckontrola.hr/files/jixuzosop.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/danuroloroxitibogisizagak.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/misikeronuwu.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/89356691868.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/nijani.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/23539443146.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sadogoriwedimakoziko.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/85975545789.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/334202626570c8adca6f703ee646a398/bifewugagaperizilotofipu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9721110a---lavoti.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/zidos.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e610c1ddbb---numuwogabikonutawige.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/dozivi.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/julive.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/sasoxiwowodevopefatiraba.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/lolimabutir.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161417200f180b---zojanojuzinexu.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/13/55636290913.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/64501565536.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/49174472861.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/62631508271.pdfIn PDF document text
    • https://profesa.net/userFilesfile/76436851641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=boxplot+categorical+dataPDF 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_off0000bbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB6 17204 bytes
SHA-256: 75b53b22dbefdfd90fffe9647793c6489348e109693dce4c9b983c4346fb3a16
font_01_sfnt_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10572 bytes
SHA-256: ea924c05bfdd851c2dfd82f488cddb1e093b89c4eabd30b8171771cdffe9ec72

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