Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8a90cee6712063…

MALICIOUS

PDF

70.6 KB Created: 2021-05-06 14:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 25b9c679e7f5e30ec2edc175db536162 SHA-1: ef69e2f4ae1a0e3efd7be40ed6d5c6b8a7f550cb SHA-256: 3d8a90cee6712063afcfce1907c6d5ca5ee0beef64a7556434ee1b5d02e73d60
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=cima+f3+study+guide PDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea1dc8967---funomexawerozaroxoma.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a9b4aefc---kobiligafexex.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/818a8e4e1d77f9229f1af62d4df531f7/67617315259.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b7ee86a70e9fbf5c472f0c47a420b796/36433169634.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/3752297634.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc7d488a3---72986503634.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/chb5fniq6pv9d06l27nihgqrm6/bemidisalofujivefike.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86f251ec0---xikefezetukukunazut.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e974786f3632c5c18482072b7b92b651/lutusuket.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/77190661924.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/09g9fh20hiluue7e3pmuphm8cj/vadowotaj.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/umprsrp3rurghc2b6d62tolat2/kibitubonenebir.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bbqju1tiqfgsvtvs3s2mi5q6lv/zevudiseri.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608738b1ba377---silorexokomalifabafad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 5268 bytes
SHA-256: ffad612db6ed1b7499677e1ac95df37621bb69d6b6671a6b22e79af85447ee1c
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10776 bytes
SHA-256: cadeef06d1f6328ee431122ac549b1261f44faa01bbacb21e12ec1e211dd94b2

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