Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ef832810243d18…

MALICIOUS

PDF

79.2 KB Created: 2021-09-04 03:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7726311bcb4d20589b435d3a0f7ebb70 SHA-1: 592f691209aae9a13617351d69a83fa5128da23f SHA-256: e0ef832810243d18f2c98c1d167d6e726c0d7569d239d25780cd875c876b1a45
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as containing links to potentially malicious content, including compromised CMS uploads and algorithmically generated URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. The file functions as a link farm, directing users to other PDF documents hosted on various external sites, likely as part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=inter+bank+participation+certificate+pdf PDF link annotation
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc17b0fb5---vusitas.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/wevuwupezoku.pdfIn PDF document text
    • https://lasanisports.com/files/wunizumeluwazovidatebuj.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/9835750007.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/66225022405.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///wisepoxavanabotukixodil.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/326978cbd6550cfa4c8efe5e04eef8fe/85443777909.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/wasamerono.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xutetanexorokexope.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/43869725283.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/gudezed.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd659d9918---mugojewimufixakup.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60e68353a---84014937289.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495e80da64---40325293270.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/77966008594.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/taxubotojamobemugu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ko41ramnimvfcbd1268eqt5lu7/86278867997.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/fetiluwizavuxad.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/vuwevofadomiva.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xomavopazifuzef.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/pupolipufagusos.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ca66bfde8---xalefajove.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/035855a70e26b1a7adf733fb741afcfb/bujikub.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/210551338060.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/27205837600.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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 17272 bytes
SHA-256: 646fd1a6743ce4595f2888f22913f90dd87b399a83b1a683522d480d13ededf2
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 10584 bytes
SHA-256: a6b7de6ad197085b00814ca76217a6404549de3f50590d587062b9241a6ad5a2

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