Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf0445ae86708f5…

MALICIOUS

PDF

84.4 KB Created: 2021-07-10 07:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ef578eaf5641f0964956725cd51ba2c SHA-1: 94119004e8cb59f2fc5faa83c95cdcb8cdd9efdc SHA-256: bcf0445ae86708f558810cc2ebf1fbeb81103c8002047f130baec2452b571663
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains. The embedded URLs suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608caae350e63---ratugaxajupapogaw.pdf In PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/22861994858.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee24793f1a---57785512004.pdfIn PDF document text
    • http://midel.me/userfiles/file/74889580961.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/14906984476.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/127100608fae4ab380f82341914ba0de/25156153237.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5cfe740c---kimenad.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/nezoxi.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/17903921065.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3p52eiideajoh9jctovpnlsc35/4545302884.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062415434626.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/dabelogerasesafegu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086811f117fd---mepogugodoxid.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df42aeb3b0a---midijaduwasoza.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c04632013fccb8e72142cb4358fcb9b9/lalusevubarolonif.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/012a41ba90ac716e4baf21dd080c42c5/42753200453.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/pafem.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16095d640a6d4d---vijuraluzaduzigevijizo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68ea924cf---69048974786.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/i4b9e8iq9dq2u64m2583hlgdk0/nimapivipakodaresib.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/movivizifotezoret.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bc18cub48oa1ijrdg1s8pmja1b/mitizuvufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=and+still+i+rise+poet+angelouPDF link annotation
    • 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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 10648 bytes
SHA-256: bfcffd703038305985844d18d4c18b5b9777bf63fab7c226e3a580cff9f4bfe0
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 17504 bytes
SHA-256: fdc074396f0004754af2c620466716901172e5278271232a76e6eebf1d9b7bf7
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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