Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d7a7dc2932b745…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 15:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 979432d81830c83dde13fcd83046d8ee SHA-1: b0015ec06abd8e804fc82b4e8caf7ce1f1799e9e SHA-256: 73d7a7dc2932b745ba99f24d3627f66f1637ad631df7617128ca1c03755c13a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are consistent with known phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://easybuildapp.com/files/uploaded/files/zotigololaderobasipepi.pdf In PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/3057449661.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff7493de1---segalajip.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b25613dbebe492e37c15fc7bd9a4f860/17997694167.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9fd34f5d4fe94703ebc1ea2ed6f709fc/82816908592.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/nivizu.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/6070441708.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/nabazuwavor.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3416e6584---zijovawepotadumavulezuve.pdfIn PDF document text
    • http://roocenter.ru/upload/file/81615973092.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1585a15159---gevoriwozebab.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/32628650832.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/36edfbf557cbbe3ea69c7030e92b2d92/jujizopijurupowirozupa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/749535a2aed029794ca0fb456265fd7d/90385632127.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/68d4195c24f948386c954a020de1842f/zelifenu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f7a20c87---65445498665.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d324d1202f---rotekopuverosa.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1a86c863b---28245680692.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c215871b46a---zodedanexegibenagax.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/aovrd32dbn2fr9gqggrh5rfdk1/83232943321.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f27b9a4065d7e834654bfd4a4a38b936/sogutes.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/84362515883.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/sixoxuvudenenakunexite.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1858c34c---zibasexifonopal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+a+sidebar+text+featurePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 18572 bytes
SHA-256: b0a07ee254304b47588c838d956f2a85970488eb6badb0b8c262022ede140ba0
font_01_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 10516 bytes
SHA-256: 993cd4c11ed15d22c926a5e4fac02699b791ad1e22103fc20551e7498389865d
font_02_sfnt_off00013060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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