Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb51fc16ccbc38e2…

MALICIOUS

PDF

108.4 KB Created: 2021-08-12 08:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b605f9e6450fc372b1eb5e5bef88c2b SHA-1: 95534e8ffa05598e9019ffe3ad176a40675b9c49 SHA-256: fb51fc16ccbc38e2369600191b8877fa1057daa42e7ea3056aa8faa67b56fbc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous links pointing to compromised WordPress upload directories suggests a link farm designed to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006c610764b---tomikigarofopozinepojiber.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p31ajg0u0lh7dm003p7g2bm48j/razedubugexokir.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/59950329697.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/povesobofaze.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/bimow.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdac4e4b8---33359315409.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba4deae48---7896394871.pdfIn PDF document text
    • https://everestart.com/images/stories/file/19362633493.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a864cb950---lakedojugemujowubav.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf6e21ea6---migimixozabisepin.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/25475621584.pdfIn PDF document text
    • https://strechybenesov.cz/content/34703130660.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/729bd89642346c15983ad757eb3b4fcc/lezejivopigabuba.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/t4me726g86fhidf5vsmltkmam5/rufezugapasekukap.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/67982141442.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/20d2f380e762846787650c130b31a6d4/22668626176.pdfIn PDF document text
    • http://agro-partner.com/Image/files/xuxolif.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/tatisufor.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/kafijo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d99b60c9b---90965790033.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072efe148073---pamilomupaben.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/biwekufinezaxurodusut.pdfIn PDF document text
    • http://www.celso.org/download/50407521660.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd17f3af59a---xekosixinavexaxakagad.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3mamr3i4jgtaug7motv5219cuv/61707874622.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/monidekerumujedagifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=guide+for+talking+tom+hero+dash+game+download+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAF 11260 bytes
SHA-256: 3f58988426627aa527429d2266deac228a24a147c790fe01cef2bfd7dda79c81
font_02_sfnt_off000156c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C1 22032 bytes
SHA-256: e7e6e516df519700c35b5073381a200f8e57384b15eeab03f43b6d56d9642722
font_03_sfnt_off00018c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C7B 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084

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