Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8ba10c299f94bd…

MALICIOUS

PDF

95.1 KB Created: 2021-08-15 22:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4271fa92f2f50eeba9f7fe663f0aaf57 SHA-1: 8e4eca88b4a9f9741ca498f081c9a197db28a388 SHA-256: 3e8ba10c299f94bdc7e7e8a89fbfc58f406b9dc1d453b04b804845fad3f6ae1b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous URLs embedded within the document point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=what+is+a+vapor+compression+cycle PDF link annotation
    • http://selfmadefilms.nl/userfiles/files/jifowurilexawofutif.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pnsosp4r86176ps9op40dba8d7/lonijedejesetijokuvajeb.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/magotekademoliladaxakuj.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jibol.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/35ef7ed07c7c0a1dde6f0ab16c440e0b/wawitosiwulekemagumug.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8mhcgtm2hrd4sathvogo66fqa8/divedasiraxe.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/lidutezafitobikas.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae001bac1af---punozalalaxuvawenupojidof.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/sepewofatagopem.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a2b9adb27---lemivivux.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd1bc6ac8---184180242.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/gobufuposu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/bitegamowena.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/wuzarezexigudifini.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/58746245476.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/jumibid.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/masuwelemotomuba.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nipurukudubomiximawem.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d160afe56---86578115463.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/8456510425.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/16898254096.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/97072585425.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3082f5bd---45567989146.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/618c589137f2e7aebf763486b6516800/81644049501.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/86595815954.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_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 10812 bytes
SHA-256: 67b41b38f6dc540b183bcba818eb5daff11d66b73484c62e5e6e13570a736460
font_01_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001430b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430B 17200 bytes
SHA-256: abde6301f96b60818cb5b000032680e71b315c31983a465ac6c57df8f7efa1fb

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