Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea11586c00dfc5ec…

MALICIOUS

PDF

86.2 KB Created: 2021-07-27 19:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4344a9ec10ebc94ac94bf81ab9d67a6 SHA-1: 1b137f20284b80a5e44b9b0c168f6838aa170e70 SHA-256: ea11586c00dfc5ece1dcc2e420f5787d84f046790e865e08100074663119dac7
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve further malicious content. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607976502a8b5---fedemirumoxe.pdf In PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/kosojujasegepuboxupan.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/lizuluvofelabofibote.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/pulujitotijefuwugikipa.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/gipulepivimifekajiwisevu.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/wotavamumubu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ne2kpsgfb1ku89lrejklle4i9/50657632423.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3j3lpcad2pkqru32vq7ln93gd2/60195635030.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a9f099f2---sizenikovuxi.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/26532801088.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608771aaaea36---midurebawapatapisop.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/72842586802.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/1002804942.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/52088473400.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/kapizino.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/31896347572.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rosiwinajaz.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/53854852874.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/bovavokevogewidebibiz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10313cd5b---sijatojenebisadezonu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609499b3ec060---piwewoborenoxowosen.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad706cbd9---tagiwinujefurirapir.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79719c3225---lalodoj.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/57577fa0a64c4e6c51a993310e7bede7/zokipinapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+help+round+ligament+pain+during+pregnancyPDF 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_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16188 bytes
SHA-256: d9c3315fb148d8c43fff38d83c15ff48198b879116a016dad52b8b24c47fb782
font_01_sfnt_off00011872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11872 11084 bytes
SHA-256: b43d27031a764954968eaa9d8bc5a3d16270955ebff9663e4d95f26395b3bb2b
font_02_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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