Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5be110deab951e2…

MALICIOUS

PDF

88.7 KB Created: 2021-07-08 08:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7aab82cf819f232853dbf8e2c36a0b23 SHA-1: 6a89e19f289fc89ea521a619cc6befffd3f7321f SHA-256: a5be110deab951e2e00408833666eeb53062f4c8c2541cb71fafb2cc71499412
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, suggesting it is designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and UTM parameters further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=tomb+raider+game+for+android+mobile PDF link annotation
    • https://hitpoint.tw/userfiles/file/bomimotalonapefivagumigat.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca9226b0c---69551995098.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb9b8485c---68711024469.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ba9dea27---zaribozu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/16eba2a8bd21161a8ce86197f5116e11/79616110328.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087145a8d30a---36664419262.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/41231128338.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/midokoniretubowileba.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/kawuronov.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6acf1846---22362925937.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/87462400704.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210607084519.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2n90iom5vlqdb3fgdcft72fdii/lokinikolapesofokiwokil.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/kunewuxaburotagonuruzoj.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/mevozaga.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/63779275472.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b273e20e16e60c02aa83bed33280fcca/64327250465.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093036addaf5---fomutefoxufade.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/67896976696.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8925a0ad02---guperekofuxividajimoxorur.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/bakewojikivokeme.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8nqfb4ja6n98q97ihqqsjekjf3/movevofiv.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/52415258275.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/83fb32b0323f9d2b3730f59f822b1a4e/35398915296.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/89bbb6d204a05b7609cc6f9f40a71a4e/45156649494.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_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 17520 bytes
SHA-256: cefb1b84a89fa5f535b96145eec2feb7b8281dbc95a8c8c455b6d5ad23d10ea9
font_01_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 10532 bytes
SHA-256: fd16e8ccb05094e903982e1a716415b5a91774ed5aa03dfa0d833dd93a91a15f
font_02_sfnt_off00013be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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