Malicious PDF — malware analysis report

Static analysis result for SHA-256 278baf43b407be05…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 05:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee23c7bf40129feeaabda03df10814d1 SHA-1: 50caab27a5cf868b16925c011b6bdfe2ba508a1d SHA-256: 278baf43b407be0598c5a5697d3eb69ea0d76d21b3e098fd61cdabc3bfbc78b1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm 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 http://zafirkort.com/uploads/files/liwurexavofew.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/eqhd3i6ukbobhaahsrig9lssu4/dagemilarafavunifova.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/siliti.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613226908b884---57296266180.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a1c7519132bc0977dcc82fd4d532e0fd/mufolosixewoximirodiju.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/94212958183.pdfIn PDF document text
    • https://agermag.ro/mm/file/filujulanoxewe.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/70575639562.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210902155512.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631585056.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/79356010035.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/83ea2a45aca821851e5960ad9ef3ea8c/sizeludatupudafidugogeli.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/75791211652.pdfIn PDF document text
    • https://paperland.bg/uploads/file/zojozubokesobikosirow.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/21547641020.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/kamabanetaxutix.pdfIn PDF document text
    • http://cmtsport.com/pliki/wezolik.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eabde5b6e307b04fcb4c3a24a5689468/22246089203.pdfIn PDF document text
    • http://plise.org/userfiles/file/55660191726.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2250a1bef---vixezalam.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347db4b9178---tivimuvuxadet.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/89997163638.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58912053227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ranch+simulator+download+for+android+apkPDF 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_off0000cd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 11076 bytes
SHA-256: d48e3da41e13fa64d02aa861df9966c64d4f43048af9b8967430f649e8868356
font_01_sfnt_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 16412 bytes
SHA-256: 1c81d083a2a50603581df0831bf15892361c65c65306fb78e0c4f50653c70bcf
font_02_sfnt_off000110c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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