Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f04bdd0ac49d1e9…

MALICIOUS

PDF

95.9 KB Created: 2021-07-06 03:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2f6d52d9acd40d6b7dd215d82a9da6ed SHA-1: 4d66e12a7a68e81b6a280149e563d0df9bd3798a SHA-256: 4f04bdd0ac49d1e937be4d0fdb5c3902d8bb8cf43c5a6df018e03fb67eabfd99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f41ac6272e---65384578334.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/09d3fb16c7b8d1d8e06367db3c40be98/nixegenumid.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/60931731054.pdfIn PDF document text
    • https://advik.net/userfiles/file/jajaxegukugexaxipejozemu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/libotitekut.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/vanubasul.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f8da158f3953bc238927aadb21604f88/remuwuf.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c87eb01e985---lotimatoxetapigilezila.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/segosoxe.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/zivenodudisuru.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb08a483c1---madumubepanovekozigowopi.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/buxoz.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/peruzure.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa34497ae---paropinepurekujekarub.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/fnqrdb5r2pahp0ghu9kg9bm5g6/53709638663.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/31434664006.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/13846662160.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/df72244e7ae75f6eb0aa07e51d916cc7/dezemidabufuz.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a60d26bc5---tiwonopolamilusafibo.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qgg63n1btmgc3pp03m7dm61eop/49471307030.pdfIn PDF document text
    • http://azizolace.cz/images/file/nudozedusufitawuxupogo.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07102c87f---52555091689.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/vufiwubovidam.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/nemofozoramukib.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/bf470202431473bf9a56b0c4b79101d4/wanidod.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/25853656342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=important+days+in+october+2020PDF 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_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 17168 bytes
SHA-256: 00db207aa5e75fb4d7c48959f5a3fa51e9cf98d8c4f6449e4525607433b65c42
font_02_sfnt_off00015730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15730 11076 bytes
SHA-256: 5049133b05b320ad60dc214c10652dcf63b5efba2eee237768ee5df0f9ca7819

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