Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe4a198e9fd26aa…

MALICIOUS

PDF

74.7 KB Created: 2021-10-05 18:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0eecd5fbbfd092e61d464b5ef391f6f SHA-1: 254881cbe318a241c53a316e852da00f6ef68863 SHA-256: efe4a198e9fd26aa7ca68f1849d3f566760c45faa4ed5a64eb71716186cb5a05
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

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://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614618248c46b---penemunetilosisikak.pdf In PDF document text
    • http://caerulumpharma.com/upload/files/17313453030.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/sejasutapugiluzivimoj.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16147c66f0292c---milela.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xiguwanuzowakitojij.pdfIn PDF document text
    • https://tuyendung.tlipgroup.com/upload/images/files/kijaw.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/72867713194.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/lotozuvano.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/71225027687.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/kadibemogizarido.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7d82fe7d6f4a5c1cc82c7bd02752704e/21008607135.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/50224236365.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/pofiguw.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/98613155584.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/revafu.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/16772589082.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/kusimojafizisenarixasakan.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/xowusotigofabakijinixaz.pdfIn PDF document text
    • https://defi128.com/userfiles/files/jenularubuxal.pdfIn PDF document text
    • http://mirgalosh.moscowfashion.net/content/xuploadimages/file/kesalis.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/wazewisiduxelezutukuverup.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/derosodirojibij.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/98496200946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+financePDF 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_off0000bef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF7 18180 bytes
SHA-256: 941d6eb8553d0b04bac7177979028a05f91f6eaf7eb0440c80d4c9d7dc80234d
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 10304 bytes
SHA-256: 99e8cf7077334486a9183f263d1cc3d83184ddd5887f46613fe1372334d2aba9