Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe30c5e1a2e6cdcf…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 10:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4aa09e246d7a599b558f5d1793042aec SHA-1: 23bd40ef931178435161783d6f2ba77ede0bfc63 SHA-256: fe30c5e1a2e6cdcfc4783cef3bd6b64088cba6e89bc2dae6cf1c68f5e4aed390
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://studiomistretta.com/userfiles/files/xaxepupejusumu.pdf In PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/27575718973.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/26337967693.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8889d7befe0d563b285f6f0dd364e3d/fexadexuzu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b95b9252fc6---98078380709.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/segovepedubapibasovoxex.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/mojeboxiwekiku.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60142fc08---fesowoju.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f39e5d5d05e---maxiba.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/94291340003.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3d95213085fc9068ba6efa245f5cb7ea/fumabekovetukawazizaf.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/33903924231.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac770593c71---jagitunexovekarusosud.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/oc736usr0rbmlb859t9umv69f7/xatidixufebewupepu.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/34494729939.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/logepuxabepiz.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ba44a2792ffe8b594522cd6920ae63b2/55449801698.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b786fd6e25705c8bb5d3f2331798ec10/positawamesozedumopuje.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/79836795442.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/fapowewimubawosororigoda.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/57655079320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=synonym+for+infantilePDF link annotation
    • http://irodori.kir.jp/files/file/fiterijatatixiz.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_off0000c090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC090 10396 bytes
SHA-256: 25f26e2385b7d3285829792211f1202253629d4b8692b45f4f04e424a9139868
font_01_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 19764 bytes
SHA-256: 5f7cb94f72df8ea0f08f32a758240a0bab837ed6d05b898302e27ff5fdb15130
font_02_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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