Malicious PDF — malware analysis report

Static analysis result for SHA-256 2874c7e91ce86b9a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 12:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88bab61b005c656a7678b18170eec4a5 SHA-1: 5c51bba845662c513fa9296ecc0e2220830de96d SHA-256: 2874c7e91ce86b9a33e63f3fbdf91f28e5ae319a3a8bf76f00a7b8e7d9e79f43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://suachuathietbi.com/upload/files/39292248386.pdf In PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/b9ncu2ndihpjkggtu0g9r1gfi2/kodusamoromolavoxoguzag.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/99006736428.pdfIn PDF document text
    • http://adveotec.com/img/file/tuwalewawilelunezewebef.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/81933658284.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837a8e16735---83109041921.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3bb227123b943ecfe51259778c90795a/59992749132.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/ponofukufisisevepipedelo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1b598626---93090309859.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160abaff1b2ea1---33069385437.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/xipagupe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe6d2ddef---67082208571.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/27314755348.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/80866673842.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/88878718146.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/faxir.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2fa9a4de086c35089491b8e16584b7f4/62781154663.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/pqkmtfb3f815rve5actk4cdqd4/juturinagirifebinala.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/89321193542.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/47407814498.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/fibix.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d19a29a4d33---63288474323.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/91120791737.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/c1d5c3a7f37f12027dd629d621b17613/pakuporupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=medical+entomology+pdf+downloadPDF 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_off0000db55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 17576 bytes
SHA-256: 57fa7b65ac9cb499085b06cc9025ebe6773d6c10ce36676b9c07c924bb54c418
font_02_sfnt_off00012182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 10888 bytes
SHA-256: 9e9aefbbd94ae556ee70caff786887bca8bdb4e3762d89a4e1fcc7a1823f74cc

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