Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf169f30890375ce…

MALICIOUS

PDF

72.9 KB Created: 2021-08-28 19:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 572bd3289f10f3ae1aada210e1c1887d SHA-1: b65541e1717b4ce917e51dbe36766bc4f7aab231 SHA-256: bf169f30890375ce2fc6e1d8a704c1d7ed8da908fdef69196f6f3c67243d078e
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and links to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URLs are sufficient to determine its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=canticle+of+the+sun+prayer PDF link annotation
    • http://myucmas.com/userfiles/file/46321564882.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/cea8f53d08da4b7a2d15362250e274aa/ludoderiwudugapebi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798764e6cc9---terurosinuresik.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6787969802.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/piwimekemalepopatit.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/pozefututozogixuloren.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7k4214eavrt1qmbhsvi4j1lj75/berewamoke.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/denumofibeve.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/benotimaxinaval.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/navujudowekosuj.pdfIn PDF document text
    • http://snft.ro/media/file/nuxapef.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/51633652515.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/ligidenofinimu.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/xovopujudu.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/vowiwemiziwinezaperu.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/78195521391.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/nufivu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6f26571f---31976950500.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052801514970554.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611c130a3b1ac---2000476840.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/17316645499.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_off0000bd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 10824 bytes
SHA-256: c7f70ce06b9a4b0aa1229f9deddaa585d0494891f3ca1c1afc603b02f9dcfae0
font_02_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 15056 bytes
SHA-256: 4fc41124a697aeeb0171a2dbcb19e71449a3e495820ed1673433b25aafbba812