Malicious PDF — malware analysis report

Static analysis result for SHA-256 623d6c19e9d53202…

MALICIOUS

PDF

59.6 KB Created: 2021-06-07 16:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d4a53f1e7b9652d26f0fd366abbf4f5b SHA-1: ae8e55bc8f73b0d0bb0c8e5e68c4533363938ed4 SHA-256: 623d6c19e9d53202f3ad5a87dff1af106c51740d537ee4f900c4d481c7278711
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO poisoning or phishing. The embedded URLs, such as 'https://medvor.ru/uplcv?utm_term=psychopharmacology+drugs+the+brain+and+behavior+3rd+edition+free+pdf', are likely intended to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=psychopharmacology+drugs+the+brain+and+behavior+3rd+edition+free+pdf PDF link annotation
    • http://industrialdevices.in/uploads/peponasazimagub.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9757496d9---42716335652.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160804fb457d4c---52529120382.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/70766524353.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b15e22fccce2523b4197ca989e8b4d8e/rukudabezetofuzalovus.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5454204be---tupivikoxito.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/f58b5f88b1a006805e93c1a2d0a196ca/11131404638.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b1f942752---87102602996.pdfIn PDF document text
    • https://bselink.com/userfiles/file/16193915929.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/96285756723.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile/%5C/zenefonuzizujawepar.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/1054465459.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc4d717d8---20744276987.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/357e84076ad70fd81c2840b921ac7333/91359668926.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e702ee8d3---48831730541.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796daebb1ad---82633983962.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/kq0l6oafkemt0p6ccbg6s3uail/49195588070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77A 6036 bytes
SHA-256: 3d0526ea7f5a87a28b31b6fbb26e310cfa56d8b091c045b76c33fd710f0d42f8

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