Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3086b161381c9c…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 16:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c3dd0223fb8257dbe150a666b0c117c7 SHA-1: fe566d8c7b0dcf2c293f395a36fc8dda4af40495 SHA-256: 1d3086b161381c9c7f9734dfc2eba577457dd104a697cac0ed946c90af3ca933
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on compromised websites. The presence of multiple links to compromised CMS upload directories suggests a coordinated effort to distribute further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/173a6295b7e1deaac69fc8a35ebfdc3b/nudapixexupopeno.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/356839d9d1cd736f199454eed1622763/baxujazusojosakagol.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/larubebojenogivo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4f0893fdc541b44b6fc3e7365ed06517/defekani.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/16479956048.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6h064e19d50tc94e18r8r73ll5/rivurukuxijobetaj.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6a8bee6ee2b5d17339a3dcb3711996e4/jaxabovirozo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad52003664b---woselidojewaro.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/soride.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/9915906832.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b3992fc6---44677828490.pdfIn PDF document text
    • https://magatek.com/documents/file/5971209931.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608085ca7ee82---jafudesavofeverazubawarim.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d41852119---redibutik.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/32337909526.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/83690419127.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941688b713f---gosipetajof.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3372a6649074727473e3dfaddd0a773a/wulopototigog.pdfIn PDF document text
    • http://wernitznigg.at/files/67437949663.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/revivulawukinevi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/be406077fc6889e59f665e99eeb2664e/karijap.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/mozimijopare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=volunteer+work+is+a+great+way+toPDF 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_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 16912 bytes
SHA-256: d584b10df142f2a5c8e86fc82935878a80a76a53e04a0db3f41e53ab4dc0b6dd
font_01_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 10644 bytes
SHA-256: 9e9e0ba461614ea1312db6b01de8f9b608af6bef89f3aae70d8498fde7037be8
font_02_sfnt_off00013808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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