Malicious PDF — malware analysis report

Static analysis result for SHA-256 2151a3317cebc58d…

MALICIOUS

PDF

97.7 KB Created: 2021-09-01 00:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1bdca7bd4eb877b9ca56a684b76e8a8 SHA-1: be6982f0c4242181563645cb94f4d40ea898be71 SHA-256: 2151a3317cebc58d9c72cbb028803b9b3da5936eb693aafeb88c0eb67309f982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://infrive.ru/uplcv?utm_term=expository+introduction+paragraph PDF link annotation
    • http://abogarestudio.com/userfiles/file/witozukumuju.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbfada571---69234650947.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6a921a5b38f04c083e24b76fe20872b5/wixixejijipotat.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/dinesuranakume.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3835f40a10---38737320327.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0152e469b1---sikatatabekezudowaxek.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a7996bebcb1f64161dbe3dbd37a36c47/78907872627.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/25660734263.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/17957981954.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/17559060390.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99302b107---gajanabokotamu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/20ebcb048bbec766ad59d8a810ea2f07/60799564199.pdfIn PDF document text
    • http://svx.su/ffile/file/38553481455.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/94377e9cb299acf5f583a224f7bf3b26/kesepajexesagovoruvexu.pdfIn PDF document text
    • https://mobilityservices.it/file/suwazorumezi.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/65473236693.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/darakixijis.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/105ecf2610a115558db4681017e4914d/kexofiroweximifilevu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e2e362f884c42e903d0a86441207d621/67506974559.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/21606526922.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/62414351407.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/telibanerilupetabunate.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/nazisafugoresubeguvexowix.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/054b7c553ced67d92e82840ffb291092/60985526030.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/miperumivonemojadazajexo.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_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 18752 bytes
SHA-256: 538e23c1b96f5b9ad06cb0324244039ac716854ffe3cb20a77367cd180623ab3
font_01_sfnt_off0001470b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470B 10916 bytes
SHA-256: 417c23aff7fc17b22f0abd4b1ac42c32de896d4a2a469f06240c99b68277a381
font_02_sfnt_off00016019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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