Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ff18c91661cf9c…

MALICIOUS

PDF

43.1 KB Created: 2021-09-17 07:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d3047d7d600398ed991424a124d878e SHA-1: b9bb58215859fd850585332a6edc77dfe1e48c82 SHA-256: 13ff18c91661cf9c423edce9694c4f50f2f1308b36ec5c3f7eb7cead801a1304
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 external sites, some of which are hosted on compromised CMS platforms. This suggests the PDF is designed to lure users to malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8035

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://chcial.ru/uplcv?utm_term=android+use+external+microphone PDF link annotation
    • https://atamergranit.com/userfiles/file/bokuludiwatimafir.pdfIn PDF document text
    • http://ropesadventure.com/d/files/86228047104.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/wipevudu.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/20685698843.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/65098831455.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a60b3ce3411aa162f2a4f2230112ac1/29331858188.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911053051009.pdfIn PDF document text
    • http://redactron.com/userfiles/file/nipuluvezesede.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/786547349.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/zodupidag.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_32779C27DD87D886.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903035248421020.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/nujeduziligizotelu.pdfIn PDF document text
    • http://qzgj.cn/upload/file/37783056471.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/kajodopesifudewaw.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/65938693640.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/82a61c42a35e2d2725a10ef4d60336f9/gawidolunujozesodi.pdfIn PDF document text
    • http://kechengchem.com/upload/files/kekonuroxofidaxanizeke.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8249cc9d1---68149516182.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/sivaganasipuwas.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37aa44d7b---dulax.pdfIn PDF document text

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