Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f8034206d4847d…

MALICIOUS

PDF

85.3 KB Created: 2021-08-07 16:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a867e73de06add663e6ce8eda3cb396 SHA-1: b91663dcb747508ace6492e34553febfc5eb67c8 SHA-256: 17f8034206d4847d2e76e672c70955e945ad4b1dcee11e0e248691701832be2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious URLs, such as https://pixomot.ru/uplcv?utm_term=the+deer+hunter+piano+sheet+music+free. The presence of numerous external URIs and link farm heuristics suggests the document is designed to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=the+deer+hunter+piano+sheet+music+free PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df28e1df7e---vopifer.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/77890712436.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/namotitixuzitisi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2945d3ffc3f155afe37146c2cd904fad/73517351239.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5488e380---pebovepan.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f92ca4edb---44233767887.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/66934365642.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kimulekilojigelubew.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/64449187530.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df690bb977---lanokisenemevikeporuloz.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wewet.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/piriwaxemelorem.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/24655451250.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/bijesejitiwuzezubuwoz.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/82135279069.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40b7b974a---kunepib.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf89bd3b4---zefanabopunozupememas.pdfIn PDF document text
    • http://mav-auto.ru/images/file/nudimogadin.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/vopodekilaligonuz.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608762a51c8a3---11196300828.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 10904 bytes
SHA-256: 1f66e793c48393a5265b02248ad3a5954ce7ba15490d44c460745e16e4af975c
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 16904 bytes
SHA-256: 24649936bbf2a5cc29b329aa4c72ca0b113a9a8d67d05b7e4784d570df0914fb
font_02_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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