Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68f1fa656418844…

MALICIOUS

PDF

88.4 KB Created: 2021-07-21 16:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3fa131ac849711d36e00bcda6014176b SHA-1: 096cc9efdf4e4ef134226fafa524a90e9eb969df SHA-256: e68f1fa6564188442e2ad4f571cf9cef98c283627f0228baaf2561ba4dd9fb15
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress sites and disposable hosting domains. The primary purpose appears to be to host links that lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://shiokuda1.com/contents//files/44838257240.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5k4n5a7qdjs6696iph241sit0l/nobimidazaji.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a3c7a051---paruzorodekimewojutizalu.pdfIn PDF document text
    • https://plasy.com/uploads/file/35407077965.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a482c5e8a7f---xedevavabosolixifutos.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/b5d0c84b7fd7fa4c6762036133d6c242/kerexirewemanu.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/virabo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/17291665206.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ejv5rodt0bjhm1qonlv2577uh2/riweraluwukasi.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/wabifogavu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/84362695047.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ea9e1a2c10afe9e18f14b00c154e9e62/41079760573.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/9580548830.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/41591302591.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/sotilipaf.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/xisoraxenodaj.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/698a4502847baebfa3bfa5818289c3f1/xagarikadixozi.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/wavorixexuvitakafoxerab.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc6a47cea---79274684361.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/4647619312.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cc1cb36b2---bebobep.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/kokin.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/jidurimuli.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/lozidikolenituzupujoboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=coolscan+4000+manualPDF 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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 10300 bytes
SHA-256: 9bd88d15bfb312d73ec5bc25e3de8f818566a519561736e790377431299c55e0
font_02_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16716 bytes
SHA-256: 5083bb52d824a622fb26de7f404b31da21c377cb78cc1f29b27e3f4952479a45