Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9d75fea6307f40…

MALICIOUS

PDF

91.1 KB Created: 2021-07-01 18:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b76400be11861a3ddfc6036a35ab4cc SHA-1: 8f0cff2995ba90bcc3a33cea6fa700211a879760 SHA-256: 4a9d75fea6307f40e09510991562e37eb4e0c44cc4bc342e72b42eb5ae423e50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and URL patterns are consistent with phishing lures, likely attempting to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=theories+of+counseling+pdf PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24c91c630---82794758001.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/v0c8jr3o4nafrnmfm4f4r1fc9b/nutinunomor.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/diketaluve.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60bad7a53---simopadafiketivunutof.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5b413cd8173be443df3f41b26324a19a/witawawokigu.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/34308140013.pdfIn PDF document text
    • https://realschoolspirit.com/scauserfiles/files/loguximizepawumi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcca5679e0---47964163474.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f681d889e---fozozugasosutuza.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072d648bcff8---71364422467.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ftrfhmtrludli41veaqfflntcc/73458561938.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/22meb07cst2a27tlggi5f80js5/zexudakibokutisobazej.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7a79e231423f70a6417d17f69b6ca1ab/32746341032.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/34889919382.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/dexeroxefivototaxejokaziz.pdfIn PDF document text
    • http://stevis.cz/files/file/vexajosabobokegogejadonuj.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/443a4cfa97eb04ae9e7352994022e7aa/79820544174.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/37772201940.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/bizulilawos.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837e1678fe7---vefebegu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/eff8414d162ea2837e29291d7c13dd30/xesorum.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b78cdea486d---87035149882.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce74c22bf---24456855876.pdfIn PDF document text
    • http://nessium.net/userfiles/file/xopoluje.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077190e61f5a---52707527319.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_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 16628 bytes
SHA-256: 3723d493009728f2c0a38d49a7b59b63facf72ec2c419d0230abd3498b6e9168
font_01_sfnt_off00012ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBF 10700 bytes
SHA-256: 4ebdc656717341eb6421db1d5e145d222b05fd841ba6525f99c01211ed161198
font_02_sfnt_off00014700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14700 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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