Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef44968f06f15b3…

MALICIOUS

PDF

97.2 KB Created: 2021-07-05 16:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6fe395e33077537e8aba1931678ea7e SHA-1: 38f247b57d127b2a324630d6fc6bb328594ac15a SHA-256: 6ef44968f06f15b323a9542a3493fea8a7016138a41667f1677da6f8e2cdb5ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://drafthe.ru/uplcv?utm_term=kirby+fighters+deluxe PDF link annotation
    • http://rspon.pl/images/wyswig_images/file/99547033804.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/4732852834.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5b18a02a---gowukezugidumupibok.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/oea241ii5bag7l66jmm36dannh/50346162747.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/3d007c1f659cea74e64a1aea6fdf3bbc/46449725747.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/kunopex.pdfIn PDF document text
    • http://balone.net/_upload/file///81538593283.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/99a54e1855db1bfc58427ac978a79c74/72870933028.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/todiwegetizowike.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/jonovavawiwelomeg.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf3ad5ea8---wajotumoxo.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0f10d509---43149194704.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fojirudabanoxevagokadip.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/81017553369.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9ce62bca5---rujivalizekitijujewuf.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/kivavofuxa.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/terarumoxevit.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/vuromiwiwide.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607632d932d21---16489752630.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72367807579.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/97236e73ff6057db2f1797b01e144a28/35343486189.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/7e5b96b441a5ec81a32d4f5afc352265/fufef.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/27239079611.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 2528 bytes
SHA-256: f1af7828582cb340b0eb6390edb66d2703fbdfe555555036ca6a374c96e95ebe
font_02_sfnt_off00012d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 18880 bytes
SHA-256: 71fb7b7f0664fa011ed1c3490c711cbc632c659221d20deb4390e61ce25049d4
font_03_sfnt_off00015d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D92 10692 bytes
SHA-256: 5a59dd2689c2358af48eeace6b117ce7cfcf3e588ab17718da250638129152a6