Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a8dac311e056cb…

MALICIOUS

PDF

60.8 KB Created: 2021-09-28 12:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65b49cf8cba94c2a41043f2b0d2c998b SHA-1: 7d85b0ed0bb02c4c47bce268f2b7d717e0bcc5d5 SHA-256: 43a8dac311e056cbc13d9fd5afe1180f2754f02b2416dcde91d8785a49777ee4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4569

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://allytemp.ru/uplcv?utm_term=dream+soccer+league+game PDF link annotation
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613574ac5c058---95914000562.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/10136266668.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/nirex.pdfIn PDF document text
    • https://tebra.si/userfiles/file/lewibozapeduxona.pdfIn PDF document text
    • https://rajakedua.com/contents/files/nizuzuduwarikuneli.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/4416362954.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/70837733082.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/72273082879.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/xanode.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/ronimexasavatanod.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd8176df78---83373705511.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/91639611466.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109062312092507.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144db2078f02---kotumizigilujexurapa.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/40197251863.pdfIn PDF document text
    • http://knipia.com/userfiles/file/32163607829.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/91543591063.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6a881f36375a55e64e90d6ca33519f1b/fuwibuwenesuvapakafetur.pdfIn PDF document text
    • http://skupka23.ru/upload/m/86276717749.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/wevewalategajaj.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/fegimidanijupo.pdfIn PDF document text
    • http://sergeybazarov.ru/file/39854085433.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/texabutenarolawog.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/rufeb.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/texasogajasatar.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/bubuju.pdfIn PDF document text
    • 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_off0000b25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25F 10380 bytes
SHA-256: 20cef163640e1d5dc14128daf2cbd663154456f7364cdc777b1ad2a60a3c3331
font_01_sfnt_off0000c9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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