Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c3dbe7f579ee66…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 09:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6ec5bedc5c94eb3a8900d01780bb4c2 SHA-1: 3aada59a97d791b868c6ac4f4e44e091a6c2e1a6 SHA-256: 91c3dbe7f579ee662138085508c0adb1ce9b56f11cb0bfe18fc13b3bf4f91038
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of numerous unknown URLs further supports this, indicating a likely phishing or malware distribution scheme.

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 https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139adbc16043---10076801949.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613100cd41729---85382887655.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/lovop.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/28725602894.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/p81ggjkg4h9pt1t8p24o1r1asq/lelunefatokedav.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/4146649.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/pawuj.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/15080954557.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/dekujemugeritenibugumob.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/89450523993.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93c0a0727---didekun.pdfIn PDF document text
    • http://capital96.com/userfiles/file/badezabuvalesad.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/90005408379.pdfIn PDF document text
    • http://haphadoor.com/upload/files/51273138201.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/migesotolat.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/90088721293.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/44318739222.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sofepenaw.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/pidenilugokanudixodozidu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4hobtp09o39d5i0ib6ref2h817/49078570375.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/kijoxusul.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/81022795696.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/49439547718.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94b42224c---xefavivegenubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=muscle+knots+in+chestPDF 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_off0000bb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5A 15828 bytes
SHA-256: a65306782b07853544b52c84444b92aa63125287dfcc951d7f15cd4b13d578d9
font_01_sfnt_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 10252 bytes
SHA-256: 8c08947b06892ae83b01bbebfbe9aa92fe9ef0a748597c2a84e67787823ee0e9
font_02_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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