Malicious PDF — malware analysis report

Static analysis result for SHA-256 878f1aae4f9df85e…

MALICIOUS

PDF

84.9 KB Created: 2021-06-28 13:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 55b4f34f2aac7962a77ed3545b9f76e0 SHA-1: 202ba1b0ee1f1f3c478488dafb5a61720c72b408 SHA-256: 878f1aae4f9df85e58426aed412f01842588300a01ecd27326b08f5d361beab4
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to domains associated with compromised CMS uploads and disposable hosting. The presence of multiple PDF files within the URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://smidgel.ru/uplcv?utm_term=area+of+velocity+time+graph PDF link annotation
    • https://charterfori.ir/basefile/charterforiir/files/25943523290.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/5737860795.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080266d23430---mibisomopilakuzegi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6863a91c5---jiziwuxidatamob.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/e9a27363ce6305c024d36a91a5afb103/61184004347.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/lorawogelekujoni.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/eaa79e18fdbcab2d58f5321a8962628b/turodelogaxo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/240fd7351cc54bf20906e2ddad1e4872/poxekusur.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/092c3e5109b4ee5d845f966040bc20c5/31514857207.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/19456798432.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090328527cfe---91173094322.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856ad575fd---73671074039.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/22524748516.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/zalef.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tbbudf19tsid3ucs1sqj63u788/setemafazebezapegunete.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082e81722116---10426541366.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/760113a92e87fa3a0f4293f33f54752c/93448902492.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d7d4e7f9---33083338023.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/cda1f7d840b1bef743870ff3c4f6941d/71675646164.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/fosux.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eec897eda---35665829766.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F6 16724 bytes
SHA-256: 2cc2c1e7325ed6e712c9cb3c71b666f4d2e66b44e6f8ddcf3bd9478ce0e85f39
font_01_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 10816 bytes
SHA-256: 37b4d4af35d87cc5adbd114d3414932ef14f136a03068e5d0af5683eae44488d
font_02_sfnt_off00012ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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