Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff51395261e3b01…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 04:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 174fd3d946077c666c1e5303326fe141 SHA-1: 7586fd0d940227e1e0474fc38932e885ca4dd158 SHA-256: 5ff51395261e3b0109c5d6003046633ddc256b1a5cefc00046d603dcc168a2af
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=how+to+add+picture+on+word+document PDF link annotation
    • http://pes.edu.mn/ckfinder/userfiles/files/kurizi.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0c6cbb5e9217a5b3f8760994f36d5a7d/bovav.pdfIn PDF document text
    • https://aedwea.com/upload/foto/jovinagebewitalarusus.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/kawebavilafuk.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tesitunabatewukomevuj.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210810034937.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/xomuzebi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6572d44237---84279668759.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107151851431907.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/50948270195.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/76280153169.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f968748125---xorunewim.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608195cdd1abf---43578601512.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/ddacfbf3933050e1f4e6c2e9487e67f8/18524858522.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/monupiwonolu.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/81942883187.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102cb7b742a5---lojuz.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0fc50eed5e94501ab363edc959b8120f/negusebezomiw.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/vupizofavavojabimoxuxus.pdfIn PDF document text
    • http://walkercombsfamilyreunion.com/clients/d/df/dfd517ab040340b2551da60fba195f5f/File/31636799020.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/siviwijupesilu.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/favekosijijepatagox.pdfIn PDF document text
    • http://nensi.si/upload/file/vurelum.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/92989378012.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/oggful7knipd35bf9lrtab21ab/jizoruku.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/pakelagebov.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_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 10640 bytes
SHA-256: 18015ee1d177254d3543cefc892d92647e45642087339abca31e9b36b3433e28
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 17352 bytes
SHA-256: f687bad370cbd745724f4e4fce51a3bdb2bf2bba6939c33cbdab9e4147f82d8d

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