Malicious PDF — malware analysis report

Static analysis result for SHA-256 f754e5c88ba85668…

MALICIOUS

PDF

73.4 KB Created: 2021-09-05 15:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67c0e593e96335d4283bc32dc3fb6481 SHA-1: 489fb5486ba595b5c42c7651ddc23400a7316f98 SHA-256: f754e5c88ba856688885b08e5d7d4aed74b867bbb3674d2b4c35108aad09d91f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://amblamy.ee/upload/file/90984489509.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/iam6gj5g920mlc2pj8vrq0e3i3/paxomu.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/dipodasidotiwanuterasis.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/punibuvulofineginu.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/90030354039.pdfIn PDF document text
    • http://adikkeempat.com/contents//files/wixudijeko.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/27241701294.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ec4159eaaca1d5c1d3f855807dd7a078/wuxebal.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/78421725533.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc76363464---bewuzikaromibaleketaj.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/52424186430.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/dezoxiwazubituzi.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/08/19/43129932244.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608359b9720ef---kijiraketazaxe.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077335a3470f---towulugorijenofufow.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gogasudurijusomadekive.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b753636486---kimirosokulekamigunig.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/47774755242.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210703/file/16252964175009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=active+and+passive+sentences+worksheets+ks2PDF 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_off0000bb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB23 16148 bytes
SHA-256: 74679303b37e7add99da84c23bff11bda42a7efa1cf2e05db6741f45b16cd5dd
font_01_sfnt_off0000e472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE472 10908 bytes
SHA-256: 8eea3bc94b3e5c56e9657948801328292ae34906074de09177ddbc7de1daf05a
font_02_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1