Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee277710fd2d1d7…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 22:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2051af3e05af6109751850e77672295c SHA-1: 3f7931c11bd1c78f609d006ec532d33127fd1ca7 SHA-256: 5ee277710fd2d1d7048124094291468a4f655a92d2ae3b7f3cadfb099fb78ee3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, functioning as a link farm. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://laborke.ru/uplcv?utm_term=indefinite+pronouns+game+pdf PDF link annotation
    • https://mudraconsultancy.com/uploads/files/91243751484.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/896335b57c4425484a4b1f11fa19114e/nuretaxevopudunisume.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/pqfppve0203cacpl0idvn5be37/10878539374.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076a33a23e58---sedodozifisojaxewuxaw.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/18920722980.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/18685989030.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7a0d145646a6c06b6f57ae934d43879c/lokobarozojelukogi.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/3028935243.pdfIn PDF document text
    • https://triosms.com/userfiles/file/xavipobuwetijajiji.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6851d7e68---lijazeluzuxa.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b005d980---gadewemejel.pdfIn PDF document text
    • https://badrivishal.com/media/pitaruxusuvurus.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/155140t30s7d0erb6ldvrts9tt/vepanut.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec284e814---zazar.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/74759754234.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/92495165505.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/59027286339.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/69263780134.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/rujemogerunaxavuv.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/12491040219.pdfIn PDF document text
    • http://iccarrentals.com/files/file/roxelalabud.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160701f563317a---95242761127.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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17868 bytes
SHA-256: 527059c9039164bcfc119aaaab0a786b73d086d661dcbe024dad09acfac54698
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 10844 bytes
SHA-256: 27d8614123d834ed96cdcf7cd35c6fb681a437dc7be13e6b559d555352729837

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