Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ffb8192554de53…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 20:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7705f3a4fc1e76d130c46116f27678f7 SHA-1: a1c09ce7b743dbcdb5f2e03a73829c3332152d54 SHA-256: 91ffb8192554de53c82aa734bfa5b31cc2ef9253e9f4518c8fe4471db8b712e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress uploads and disposable hosting domains, likely intended to redirect users to malicious content. The document body is unreadable, but the heuristics strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=solving+addition+and+subtraction+equations+worksheets+pdf PDF link annotation
    • http://karpatskiles.ru/store/files/vejupizobakotisozab.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f82dab932f4de0d5295e67f518b7c74d/18944396240.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7b005629---zalufe.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/81322589940.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dd269a498---wipovokuvotizaxixujiwe.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/v0kc31v55d11qfp34vdsv3buqs/kituledopelosefixafav.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161119acb7b1c2---zijanegasisexalukosogow.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/vudebeferolusakune.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210806194531.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/dizureliluzejexa.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff1b7c9edf7---doserijanegunivirovu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sizaxofekubenu.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/55148891460.pdfIn PDF document text
    • https://fototipia.hu/files/files/pebotemefajasonekewiru.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/zupamutikenerediwesegolej.pdfIn PDF document text
    • http://classtool.info/upload/files/zomatorubusolepuxegok.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075117530abd---44902236837.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06a73850b---guzubak.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/giwuzidibimex.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/81d5dfb810e7faa08b10604d3c540cbe/mixivekuzati.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/gojetogemelutin.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bd9b72bc6---77304007530.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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 16328 bytes
SHA-256: cdd8bd1330b937c8c68a31169e4020a5ddf8b763882276937b9f2309c43dd1e5
font_01_sfnt_off0000e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 11604 bytes
SHA-256: 2351d9e1a1b547c2f3dd506148500ce62606d0e0914a9ab5506ba36c8995abd7

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