Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fef9f83827dbc18…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 08:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bc5ee9303cfa99adc347dfa30732da3 SHA-1: 3a97a04e423e3f9acd6e62946e46ab229e628d03 SHA-256: 4fef9f83827dbc180dc8e5c8c64a2c1e50cb99877178b8a610a6304a2876e6fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=best+games+for+android+10 PDF link annotation
    • http://zeroseistudio.eu/userfiles/files/torixilunavuzona.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/23958089443.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wukefavojiwavelomow.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/2621616340.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/28543399832.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/21857319051.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/perobelitelofonu.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/rakulenesotidagupaguduzi.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/6016322640.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/26067670054.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i13qvnnlqda0q4l7op0dh39lm8/59621787934.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/69144076807.pdfIn PDF document text
    • http://e-district.org/userfiles/file/85542681719.pdfIn PDF document text
    • http://webantikvarium.eu/tmp/gosutupebubeduximadixida.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ced7772a09e9589e46493bdaeaf234d2/gudunadijokukofegerununi.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/99780092956.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/82886694693.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/fatabanuxudikutibonogonor.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/nowozakavesoludi.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/97871903392.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/rimupozolegas.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9fac56181---tajipeximopikimikabixiko.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4d3e74ffef9a4e3f48748b8f41f97cf9/fedaguwokaxirogotow.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_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 17632 bytes
SHA-256: ee882204efcf1c6de0da5d8432dd22991dd5ca2b84ef2cc2de79d1c40c41c050
font_01_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 10876 bytes
SHA-256: 815e0a086ee06e3d4b669c3374c6e3bfa2e6a8da84d5b2238ce7493a07eeb121

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