Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f97065ce4b02b3…

MALICIOUS

PDF

87.3 KB Created: 2021-08-18 05:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0bde17f09d25f4155679dd32cdcb9e9 SHA-1: 3e9049be64c4410795bc0a361b2e1ddb29db55cc SHA-256: d8f97065ce4b02b31312471bec134b87f9aafc6608f8d86ebd7f75c1cc6f4690
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f6ad649e130b9f82738ffc43ecaf802a/tukofigexilibap.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded4b81bdb---dodifakoxurizax.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/73893790675.pdfIn PDF document text
    • http://wamer.org/userfiles/file/47414696254.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f6447d831c---liwufowomi.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/67902248877.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccab797be---vuwetu.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/6072948272.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c50436794a---gafuxinoxanumabuvuveri.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/zudidenexogotejarakizago.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/30219778501.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/pulegodojoweruv.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/55396436241.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/kuzovabikotopopa.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/77292186637.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3887518348.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/gabedag.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c264c053405---topemamesefu.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/36040489296.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/pokusebebago.pdfIn PDF document text
    • https://emmaushuis.org/pages/58867451421.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/81331518201.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/rujigefujugiluzenidemaseb.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0d5dd509b216ea401fa5c1ea1da73973/tutozujafi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b984f5df0272e42756e0aa076af0578f/wevowoditamunelotisorabut.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/mufedanefakepixezefel.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160774e78ec086---73787253549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=petit+chaperon+vert+textePDF 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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10424 bytes
SHA-256: 01986c9771235271881447fd5a44ec03419e1699b582511f6100b813cdfd23d9
font_02_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 18928 bytes
SHA-256: 06b6241d6b80d2fe903a3df43ac37060b33dc40af8f937cf43dbaa8fe060e4f0

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