Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a14070cceedd686…

MALICIOUS

PDF

86.6 KB Created: 2021-09-15 17:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3cdd40e20cbeb551cfa0799dd206868 SHA-1: f49dc6f91f2e8950528f955df6268161a8c679a5 SHA-256: 8a14070cceedd68684082d27f1b06896ac9fe557e97c8d39a3abc4356da33d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious websites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=best+duo+rust+base PDF link annotation
    • https://publicbridge.pl/userfiles/file/divum.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8b0s98oph703du793aek88q6j5/7889434349.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/8379662962.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210906_33690E84D8DFF134.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/gapexiziwew.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393320a3f02---91583396984.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/884051050.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/gopopupijifozobile.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/10299176666.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e2f33ff5---bevirosuletarebu.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/4187045593.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/55900525392.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303eb3f19e0---65681520498.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/sukoravesuremewep.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/goneg.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/15093772290.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/gopitejaxonijij.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/43250832681.pdfIn PDF document text
    • http://paradoxine.com/upload/files/40818637664.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/bepakusawexefixubokab.pdfIn PDF document text
    • http://kbchina.de/upload/tanotamagovoz.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/wifiz.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/68113148660.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/57137571654.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/71396302270.pdfIn PDF document text
    • 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_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 21276 bytes
SHA-256: 0f1e9a991263ee2322b7c174d3441d96314d7786f37dd6d94a4358016aa6c57a
font_02_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 10292 bytes
SHA-256: 714a6d0afc31bc57ae0ee57fa2883af46688328b2e063c44bead8a629423f630