Malicious PDF — malware analysis report

Static analysis result for SHA-256 039b037e547291f2…

MALICIOUS

PDF

83.6 KB Created: 2021-08-25 18:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a463403227a42382a6d4397788fdf75a SHA-1: 293d90c610c6a8c7385417d9134e54c12a2bf11e SHA-256: 039b037e547291f27677eb246b45b7b7ec15ad00cd98bbb1064ff02aa5532057
172 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a visual download button, suggesting it's designed to trick users into downloading a second-stage payload. The numerous external URLs, many hosted on compromised CMS uploads, reinforce the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=pagepro+1350w+driver PDF link annotation
    • http://ledseoul.com/userData/board/file/37282633672.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1b9fbae613d3785587e2bdcf75ff1378/lisevovubesubujin.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xelipona.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607734ee04140---57725607181.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70040060538.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/91588639868.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a213b3aaf58---lawakovidumebikatoso.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/95f89f61c5e63ea0b664c0886b71c3cb/45666145632.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9a5r83d0v0dbarep2qsefcovpe/riwumi.pdfIn PDF document text
    • http://aweibel.com/Photo/file/40716299364.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f3316f08c30---24860712399.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/xepigupexakekisude.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6e12559c19ae9ff2b379ce28d84a320c/58361258193.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210730094401.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/95d18d9c54033bbbea10a7c634f1d203/72264356187.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3a0cf4899967e0561feb49821cf3cfbd/betupusu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lagus.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/5918186965.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/42914397830.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/52023405398.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd8a2dad47---2240892342.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/95860177497.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0e4e7a4f---81101213326.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2dbc6bc79---bixigozomipatitakawopazu.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/39011247504.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/39973809858.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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 10784 bytes
SHA-256: 4cedb73834bc4189aa1f9e50bf2cd3278d983a82370df61fb0206db71daa0a9e
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 16908 bytes
SHA-256: ba42988029209150836bbae7a8673fe205b7a9bafce29f9a7a1b75971647dee6

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