Malicious PDF — malware analysis report

Static analysis result for SHA-256 8435e2daf031ea73…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 17:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3c1f489e302621111010d35a376efda SHA-1: dd47137b4fc092863fa4a4f6e22453e3ced784df SHA-256: 8435e2daf031ea7349bb85204dd9ec27c23d772190f8190d8ddeea47096111b5
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=ps1+roms+free+download PDF link annotation
    • http://szymonadamczyk.pl/uploads/fck/file/bovolile.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/47012010564.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139852b05f07---wejabujife.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/semuxipozanalogu.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/26448409035.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/luvogabuguvejutipukadewis.pdfIn PDF document text
    • http://onlinevay.com/upload/files/24110697077.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/81352527386.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/kugupaxakalemakunofoganub.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/getusufiri.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/xivaru.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/abf2da932c22ea37bc895b1941554d89/masoxoragelofokixewetas.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/82003242292.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/8671641043.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0303g9jimalt3oist750jtuloi/48369914912.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/edb8dcc6b1d1ec97fd40037901186d40/falib.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/64284062759.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/kekofovitejadelolakule.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/74901236293.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/37874843019.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/vibamobimelasigezowusap.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xonazilafenibab.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/relaw.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/30030964823.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/xutum.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/sagidabuzu.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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 18816 bytes
SHA-256: 5c3dde0be96ba6487fcdfb60e37766035211369d9567ff1d462b6b751604df6a
font_01_sfnt_off00010637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10637 10464 bytes
SHA-256: a5257ce23619ea5c16005ff6801e99df160b39a717a0ad9001a968d846d9a432
font_02_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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