Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791ca6a83a35bd4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 08:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6460593b61d9c77889aa21708394c62b SHA-1: f2bf646e21e281c13c6d0d3cfb76e62f7cce5251 SHA-256: b791ca6a83a35bd4f5382b5ebacaf8ee0acfd846d2138a20a30ddd726dee7c1a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://anukulagrotech.com/ci/userfiles/files/9459819496.pdf In PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf987d7f3---wepipok.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/16245656923.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b71ed15b1b89bb3d899eb9e553b06cb6/16227524425.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/gubejetezuwimipejawavan.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/nagigamoza.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/xonobumuvikawukirexul.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/44188476532.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/mexununupowakoboditakil.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/i5mgesecdffiveh399umhgcio8/muzox.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/95912539564.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2ed12cdbc5b7e584690eaff8b2d04549/soxudamowufatu.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210813202631.pdfIn PDF document text
    • http://allycatering.com/userfiles/lenumudakusunesipexusabo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/zeludebijisituzejodisu.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/nariduvalosexazisafi.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/40094188023.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/wugamepuruledep.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/nalipoz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r7oitrfa8r783suodc40gu5lb1/54031939969.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/76285451.pdfIn PDF document text
    • http://builderall.info/userfiles/file/tanubab.pdfIn PDF document text
    • http://ranch.pl/files/file/funugoxabukovumebem.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/vakiwijukuxubajidatim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=performance+testing+methodology+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_off0000cd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD02 17140 bytes
SHA-256: 55cb48639eb99b19d9cb04c98622d051bed28f8d3e041c59bacf9bddd84568ec
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 11184 bytes
SHA-256: 699a88c3ba078594f55ca3ed5ddb9032b628edbcb8bb7ab6cd12e35027c9a43e
font_02_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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