Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e5b0f6794d54b40…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 15:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b2b3b0386581eff6866458a9a161a66 SHA-1: b0a0010aa3c138eba7587fbf89ca50724cef011d SHA-256: 0e5b0f6794d54b40ff2e480db95d49a54070856ba659ba7afd64cddcd9721135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document designed to lure users to external 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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b5a2aaa6---bipupefiboverajuwoluzum.pdf In PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/55395181382.pdfIn PDF document text
    • http://eko-uklid.com/files/file/telapulavibog.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b31ea0ff8e57b1ced105dedc6c2fa11f/dolowif.pdfIn PDF document text
    • http://lactopad.com/uploads/files/welugobegeso.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f5b30d8f---mekikexup.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/45475477084.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/59889267005.pdfIn PDF document text
    • http://lovesenergy.com/file/29041081568.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/digip.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3de73451---fojufajimavakoxim.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/36230253251.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/ronapuvinekewov.pdfIn PDF document text
    • http://ihdbd.org/upload/files/vegafi.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/bulekubofixevup.pdfIn PDF document text
    • http://vinmexindia.com/uploads/15146233622.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/zujilobuwanuvikovuver.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/karegasokukotisokovixor.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/bonomolosajakumawoku.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/42820389024.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bewuxapunogetexezoti.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/jijinow.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/86184555968.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/23211389847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+turn+off+ad+blocker+on+chromePDF 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_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 17520 bytes
SHA-256: 544d579e9b01e315955cd4488eebee95dfe2e871dab26f154c3d38ae26efbf77
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 10984 bytes
SHA-256: 73d4d216bf22a919a52fbd180e8dedf8b907fc122b0721f2a33b24548aae196b

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