Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a389c700f0e1a4…

MALICIOUS

PDF

92.4 KB Created: 2021-09-13 13:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f13f87d3df9ffeab946ae46b0987ed1 SHA-1: e4d83f97b65b31eb0fd36b36962968763abf1ebe SHA-256: 05a389c700f0e1a423b69df17c356aca8e0b78d77eef05029ef6a49ba96ec48f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://inprovitperu.com/ckfinder/userfiles/files/39128912934.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c9154f4f---71104284624.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/16193218386.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/30461341184.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/82791705243.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133114726ff1---66155576153.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090801063996.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/aa396b22c8782ddf71288cf2615596d9/basidokusixejubukomuze.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/todekemolozusan.pdfIn PDF document text
    • https://kimcert.net/E/file/sumaletapukawogitibidesar.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/72080183212.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/4314358661.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/55829630406.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7f30ee30---femapuxikiko.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/ribavafabinivoropuba.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7464b2c78214e491bcc2bb3a617fa1da/lozagageruxeximegalusewop.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/15961069483.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/zasoba.pdfIn PDF document text
    • http://tchid.net/userfiles/file/36469594165.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/65156454361.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/36335274825.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/32878869510.pdfIn PDF document text
    • https://funke.be/data/file/navonudupuxawe.pdfIn PDF document text
    • http://philipsphotographystudio.com/54997974367.pdfIn PDF document text
    • http://nut-shell.net/upload/files/dewedadenadexasex.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/8983346817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fireboy+latest+songPDF 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_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 10512 bytes
SHA-256: 9d7c51991d75ca6a6b77909420d155e0e2bd6a2c6e0b02b2dbcd7b2d8657dc51
font_01_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 18576 bytes
SHA-256: 2ad4aeac3d3271f309623719066ad06959b7346bacfba0b096e8f82f9b5b38c4