Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb9b872622354d2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 10:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e90c7fa248addd2e71bd9d18c3a3eb6 SHA-1: 6f9c71982434f46177eed31d1cf2981fc0c0eef0 SHA-256: 2bb9b872622354d2d0b8af2a68b5fee0c9ddb000c0640168b4a7df724e3ab8ee
176 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, containing numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are used for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=tailors+near+me+for+alterations PDF link annotation
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/womaparolawodigedefodojed.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7f5a7c7317b550988c9f35d37ea99ae3/napugisugivokamatarezofal.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/podemilagalugokutivino.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a835d1b5995---12583802828.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/30415257387.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/53071970338.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/wifaregewa.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b11efd91a583baf3f9035d82d4adc557/23262897866.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/52999342618.pdfIn PDF document text
    • http://sdds.be/userfiles/file/buzoferiwaza.pdfIn PDF document text
    • http://kezmosas.hu/files/file/72768423380.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/526baf941541a9c96d12fd00aed01610/gigesek.pdfIn PDF document text
    • http://pk.mo/userfiles/file/bogelo.pdfIn PDF document text
    • http://islandpointfl.com/userimages/17046542927.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/92281857081.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/puxatiwivikerariro.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/kutobuvumifedokelu.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/68164929256.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d9fbf1bd0---wotali.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/vatekivigaregetozex.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091e3f63cc7b---54008040564.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/99289252894.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/tefadewemapujozenobevebut.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/044991bfabe09d883f7801c55ac8942c/rokan.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa8b4ffe5---45089234700.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/91263724961.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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 10340 bytes
SHA-256: 0e5da48204727292877c33529b28b4be877be38efbf7d2691cc3854c738f4350
font_02_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 17344 bytes
SHA-256: 0ff2eec3f872aa250d6d599ae4090f6bbe39db4aeb67f02def85aebd65fce40a

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