Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04c6d4ef5684928…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 07:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7980c978cecf2b2919c2700e3c03433 SHA-1: 6c155cb9905027ff3852e6a018674b1ca6401bac SHA-256: e04c6d4ef5684928f8795651fedd31389a170f9c1c0918169ad7ddb301df539e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://spostojow.pl/userfiles/file/18215949351.pdf In PDF document text
    • http://www.pranabkumar.com/fckimages/file/77112226675.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/47683972880.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/vijenekebevadotomikugov.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/xadagikuti.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/wavazi.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d5e942466---lavokuzobagedepuzupanumev.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8b4b43d43bf9a15944d4ddb08dbef147/doliwidotuxinu.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/66352288042.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0027b90822f73f5f2396b8ccaa4dd875/89107521440.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/90834543702.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xifoba.pdfIn PDF document text
    • https://betibg.eu/webroot/img/files/26715639256.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/k0kkvrvetkp3scb2urubirphe1/11036401550.pdfIn PDF document text
    • http://albertaracecar.ca/clients/49797/File/6709721670.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/gaduxorusofefuwoniri.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210829140748_s3cw6y.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/31509570863.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766b2becd0e---60711519958.pdfIn PDF document text
    • http://naucseto.cz/storage/wezibarewiko.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/zirimupenoze.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/88417360312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=thinking+fast+and+slow+pdf+summaryPDF 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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 11168 bytes
SHA-256: 89bf4dcf9328a21bd85a20fe859c858eb9cd4aef26941578c8372777cb02947e
font_02_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 18548 bytes
SHA-256: d4b8f149d86b64df3abe9e522a6805986b8df93249f161d14df8c8b6e3e39c89