Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c27bc3a299a15d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-08 22:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 256742726ce92b1bdcc7ac47983e8c81 SHA-1: 79cbdedb96591372ee673a79bb2f32ec47edd726 SHA-256: 26c27bc3a299a15dcb3878adaa8105bf64c91c111f4895d44c3085965579c424
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, serving as a distribution mechanism for malware or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=expresate+3+textbook+pdf PDF link annotation
    • https://winpoasia.com/ckfinder/userfiles/files/xugururulupalumek.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132828a1e613---75643371084.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/lofogidodesepurekin.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/74709581461.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/42116471fe3d58b2916d0babde2ec434/56801751822.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134001c06b41---fujojekomutapez.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/ruvozalixevigapa.pdfIn PDF document text
    • http://huntland.hu/upload/file/filumorekegafaxoxuwiwosa.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ec38fd6f76dfac69fe84c489f48827d3/95497562340.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e4cfeec3ce02b6c29a333105aa7eda59/xoruzujatebo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ikg1ro472j25cvv1rsk2su1612/55747758576.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/6790850458.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/dedivatezelimidofumiguf.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/7540912518.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/27857911072.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/wekazutowimezifukujo.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/30613306516.pdfIn PDF document text
    • http://linza-market.ru/upload/files/texikawi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0800850b61b9f59ec80076dfa63ea9ec/muripabokizof.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/mekilegoxurivima.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/55834661659.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/limatena.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/22962966132.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/22390187789.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_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 10740 bytes
SHA-256: e7ce7128147758cd2c11e77eb8d747640e736f8805ceb6eaa6e10cd23b4d72be
font_01_sfnt_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 17012 bytes
SHA-256: 679fb2d9cffb34b587fecd64ead401e88127e49996abb7a8f70a7bd3ca85e803

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