Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ca6a5dc21c21d1…

MALICIOUS

PDF

74.5 KB Created: 2021-06-13 08:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7e7a259cf1e4f9eae8cbcb7af3e5dbff SHA-1: 4f327e77b1ba54e9970fb5af0eeac8f3c7c3f837 SHA-256: b0ca6a5dc21c21d1578b3bbc527432652afa6e46ce8d1961e140f1e4d8367c15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://pistant.ru/uplcv?utm_term=front+office+supervisor+job+description+pdf PDF link annotation
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8a0a812379cf7a9a115a9f8bdcbd692b/52268264451.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/575791494.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/sedufitapokonobetifevipo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/51391733212.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7fb14440---67101990910.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/19257423916.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3a8adee4e---60395587716.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/7dd7eea6622a9ca08ce5d73d1c94c98e/fuwikegavule.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dc5ada94f---terufipowewodukuz.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9580f1b28---67667701389.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mtjg8cmm5smvr5uupuhuncgkd1/vedakamosin.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/87427130365.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gatelubad.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/abb43dce3f35abaef075d8e6cedb4fbf/lagokaduv.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/61166795971.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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 5136 bytes
SHA-256: 3dfda8ca26aac40421d22c1a5ecf63765ed1c77ab3d0e07f7bca9104cd923333
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 10312 bytes
SHA-256: a1c4ad9835b1b119d6c11dcab55f9a20b3ea8d398ede0e83fade9fefede3cb54

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