Malicious PDF — malware analysis report

Static analysis result for SHA-256 537868162ee1d685…

MALICIOUS

PDF

87.3 KB Created: 2021-07-24 12:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c560a259e6e9e1b9b7c4fe54e5b61ae SHA-1: 57c7d0f94672fb5847a98cc586f584ad92554687 SHA-256: 537868162ee1d685665f3a406ea5013ee468295db17d731d4a6be365a3030635
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were directly extracted, the nature of the link farm and the PDF's structure strongly suggest it's designed to lead users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://beaszemin.com/files/sudewesidezakej.pdf In PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1keo3tji7acaibgqgn9tfv671f/menulevuzudipake.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5478d230---zomokarifodojozu.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/23548505567.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/jomilepanokowidad.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7fhc3mpv55pp43qhc17cl6v600/90639230709.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2e8ff62c2cc82fdc43ff2de623bde682/genorunogukegirigoru.pdfIn PDF document text
    • http://midel.me/userfiles/file/49581730602.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cecbed313c---315041968.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be35498595c---vagosadobipuvowizukas.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/7b94b65e209bf1ee1910d7f35ab851c6/rezokefidojamubi.pdfIn PDF document text
    • https://davaocarrental.com/images/file/mafelasifulezolufob.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d577c4c6bd---12005691391.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/lotujevat.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/metelufales.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/3272842123.pdfIn PDF document text
    • https://ckmandarin.com/uploads/guwaxakorimekozewuj.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/zaxofedika.pdfIn PDF document text
    • https://incasur.org/temp//files/werubedexenow.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/gibumulawasowubixereral.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a418ca58886---1256980241.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8962cdff38---43895077999.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e98c8cf50c9aa6be0690375ba2993a72/70467928231.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/96812306998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chicken+invaders+5+apk+for+pcPDF 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_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 16816 bytes
SHA-256: 29a1f2e1f154a428d44765f984018f7cd2c646a9b899db6b3e555dd7c4170c80
font_01_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10896 bytes
SHA-256: d993118f2b60c931f3ac7dd3e9d91e31a075f961392cdf13bdc6d3f3a09154db
font_02_sfnt_off00013682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1