Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a24a28c501f2f7…

MALICIOUS

PDF

64.7 KB Created: 2021-09-27 11:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ce8088214e926e6534fa836ea2efac62 SHA-1: b3560d0285dbc80b488ad09134ef2bc70e85b3cc SHA-256: 57a24a28c501f2f7778c549045e6653f3bb3a2e9b703bb21da64ef3f16f92d68
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and heuristic firings indicate this PDF is designed as a link farm, likely to lure users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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 http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a52234506e07f3a6434c2266ddbc1d83/62169409768.pdf In PDF document text
    • http://vtaky.sk/media/file/xetiriberamape.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/83986642726.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8bc9bbc3---pejiwaxol.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/78930905014.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o4vs6d0rr0isqj6i59eijkj6i7/lidovumedagoj.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/35289279578.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/marezisavogadop.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/palowoso.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210923191837.pdfIn PDF document text
    • http://abc-tel.ru/data/File/61908588286.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161336b8e4df99---vubutarazafipamanigazuju.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161312ee46afc3---7034072688.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/pusezesu.pdfIn PDF document text
    • https://aaaxxion.info/images/file/safugidoz.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210905_203149.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/63624563965.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/84879026526.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/luvenomudamuvakawo.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/36239926589.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/9062494303.pdfIn PDF document text
    • http://weingut-suppan.at/files/60306279990.pdfIn PDF document text
    • https://yasacompany.com/upload/files/tetetoxitopulurax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=six+sigma+journal+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BD 14676 bytes
SHA-256: 49349497b2a56144285c13f00aeae2331472c875f396481ce3a5b71b855bcacd
font_01_sfnt_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 11020 bytes
SHA-256: bf73beeb6edbe8d883fea9e5510997986e6ae1e66ba52a24c03e7ce508cdb52f

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