Malicious PDF — malware analysis report

Static analysis result for SHA-256 b282f354b4a2d4ee…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 09:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d12d5d3d337569b593a7d72c69c1014f SHA-1: 799fcad82c130bf42b55fc7f4a2e04a7b4b01aab SHA-256: b282f354b4a2d4ee70dc95074bc73dfc4765a8c3f825b3fce4127b08c9aaebe5
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, as indicated by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://quick-thailand.com/images/uploads/file/sewolosoludijamoz.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/da151c9e78fb362fe233700566174472/86426140675.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/simakatixapizukosu.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/kiruzeximepakesimisakapor.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/89913384495.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/14804803606.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/63782710479.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/sozenogibunebivofelo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/91340b08aa1bdacbedd74b65e93bdf24/48658138782.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/33637391041.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ulkanq27a7ve8jl9iigot367t0/sudituvexaposinol.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/bipipaloki.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/78409270502.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/89889340941.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/79047535017.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/1856424097.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef05c88f2a---37805373484.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/35456129026.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/75453333405.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/totu0pp2tforaa02ki05uehfo7/lusedatozudabenavo.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/xozalebesewo.pdfIn PDF document text
    • http://sieuthibds.net/images/files/85326661887.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/95397966f6811e8f9e189d4d4a7617a0/5138817242.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/57132965551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=soap2day+to+mp4PDF 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_off0000b361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB361 16148 bytes
SHA-256: 88e0b2dfac471d978f9dcfcb2e2b7b071bc7b90b83ce002bba0e466069be00b4
font_01_sfnt_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 10300 bytes
SHA-256: 853e1b0ed617a844a4df7e60919fbab3d15a6ec72f77147ad5b2e3ea8c3926b8

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