Malicious PDF — malware analysis report

Static analysis result for SHA-256 c185739ead92d3c4…

MALICIOUS

PDF

73.5 KB Created: 2021-09-23 19:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d51212a0ba10f786b7ffa8075833d1ae SHA-1: 7a5db9359694682c4c2ad29fbf81554f5ac94cc1 SHA-256: c185739ead92d3c4c8ca1390a9544e9ea69fec056d46085b81d3a8fddfad2f1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://melabo.com/upload/files/2262057384.pdf In PDF document text
    • https://cordovajewelry.com/images/file/refafiziguvaju.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/zabolevekojagerokigixebuv.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tck6ucmhocg9vfen3v3ibhjb92/14890708025.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/jejixelas.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a4au2lqtonbftdkd1don7j7nn3/41100379126.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/gowiva.pdfIn PDF document text
    • https://alev.az/userfiles/file/24662830022.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4bc004d---vumiv.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dd11998745307f7813ada1aad6577a87/jubonejogarefamen.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161476de167d6e---lexudokoturijov.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/xofiborarufigoj.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/49352740350.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/99942888229.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/bujazuxulag.pdfIn PDF document text
    • http://www.perlodrink.com/documents/24491437686.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/mipezi.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/27764236926.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/41765777399.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/2s2gfd1hfn7qemb81kgepcn3u4/witotimemonidokiroka.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/koxubufasupanavozavib.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/rutagezebewizavi.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/54397391195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=note+9+teardownPDF 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_off0000bd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD551 16972 bytes
SHA-256: 05fc181b019cd903636d806ccad1efaba902ac9150fd49c7cc3dac2688ebd75b
font_02_sfnt_off00010178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10178 10168 bytes
SHA-256: bac20640be157a8585a2aab499c33837809eb6ea3d0c75a187d56043acd97ae9

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