Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d82b79d2f88e29…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 08:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54e57a086b301a6dfb446aedcc74dcbe SHA-1: 3a05e37e10afba0a8497d1240d8825f5805edd87 SHA-256: e3d82b79d2f88e29b3ed0ec7d0e3f3c30f8245e22a539f72a563a4a391359a76
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/t7vb9hpvq0j8utsv6t6g2pm2lq/rafilonuxorulejarexemezi.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/31676506841d78e00b8626ef18a17326/47063779354.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/72552744239.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210724122654.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/rojamopobe.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/b61e9e0a75dfcda59b196a108de1583d/duwegakusugafisija.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/lezowojepegerez.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/saniduwiguxugexunenapusew.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v6jud26kjkiitbbm719h8h0eo6/67915440655.pdfIn PDF document text
    • http://nensi.si/upload/file/kezofopupogerudapadis.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/gugiginerubapap.pdfIn PDF document text
    • https://telorgabus.com/contents/files/66585480489.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/cf1bfpoa8tgss1n8j3mdf53783/33482206730.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/jujepofe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/446bf1cc6eb1f7a025d394c24844abcd/sonolizofalese.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/94021496768.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/5791741060.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519e4b298---67328812366.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/76925050440.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/45b42a25e905a469978471d2d9138d72/65477492634.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/bokorez.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1462aba756---87347126536.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b265efec1f2---xumisurutuxur.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/kuxazejopobofolinononaxug.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/lefobuwagixibadego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bronconeumonia+aguda+pdfPDF 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_off0000b9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 10804 bytes
SHA-256: 3715029a9066f06c99988c9013f2350b538fd75301c516f400f810c7eca55c8c
font_02_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 15500 bytes
SHA-256: d7ca846443424a138cbdafbbea5b5ab14474d72bb7f3e0e777ac2451f692d128