Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d464b71b5fd342…

MALICIOUS

PDF

52.3 KB Created: 2021-06-28 13:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8eea883720ae757ff777b63b7ecdab2 SHA-1: 117cc5a5e98dfad0b054af4d43963545f9529eae SHA-256: 66d464b71b5fd342f1b875311b654c9e833ce5624ff7b3a09958bcb278752156
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF structure and embedded links are consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8529

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=governance+manual+template PDF link annotation
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9e398d35---mutawokirojukibaser.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070137bcd1f4---foranem.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/neqn53ucvgn8avjbh9kj3mqvkj/vidolakogofagosamivojuxe.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/giruwiwa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7873cc9510---jiposidukepoxaputofapef.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/junerejumemigomifinebo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bisufujexujuvaraninu.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/nawuziratugotifizu.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/rowozez.pdfIn PDF document text
    • http://zuche0551.com/upload/file/54698996582.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e1f0e005---78465277746.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/nirofixafakujuvu.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/9764e469c0c3f25f950429f7c47869a6/37209900798.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fajhvj05fi6rlsh51dc0cvfo0f/10460996920.pdfIn PDF document text
    • http://fittbike.hu/files/file/zajamaber.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9g1pjod8hbd3m1hqmo3tnsjg14/merusilomaboso.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/90936eac6e6a8d4f9a9ef6cc6ef9d018/xofarodavepesag.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/413d51e51d0810113002a75db6c45b2f/beruzexegazovufafununa.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/34240980059.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/qv6q24hh6crko6v9a5u82i1ho8/63722044965.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8lk52bh50sf412ve0j4k7o0qed/36262580307.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a48af5dfebf---36072110240.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/oqtqk6q7cva1v2ugrdl91tfqv6/nudipowodetu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB785 10480 bytes
SHA-256: 88f194b27958a2dfa175f6e4278d69629fdc5c562ef6e3e864e83ce56e4f9d97

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