Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b590f87c6d1d7a3…

MALICIOUS

PDF

77.3 KB Created: 2021-08-18 04:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d67bc2f864755c5d3d03b9eac6972ff SHA-1: b049a1d43656520d3c24295d178594d066e55478 SHA-256: 7b590f87c6d1d7a3c412bdf89829d0a7e060d24a63afa477884c4e1531a799ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=geometr%C3%ADa+y+trigonometr%C3%ADa+baldor+3+edici%C3%B3n+pdf PDF link annotation
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/094cb37f70d529179183018757e0e656/54421128446.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/36951254264.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/u1d6112qv23g0r1paskrolv4mr/97487378112.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/6677057219.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b632ef17c7e---1982284498.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/pogiziv.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/26434516456.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/9cf8de0f339767b0d7b4446336a76604/misipufozusivakixige.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2f6544c8f31f2ea2e0bf7eb435c3eb4f/58772215925.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/voluwevuxarexujasajadom.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608222419b069---nowewolavejin.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf987d7f3---wepipok.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bc5e29e4---74157404573.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/diposetuzimeraletugapegop.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/23231331011.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/55630284117.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/2634921552.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/69f93954eb9137ce29570e6c45a7a56b/vivilovisuvinefedoraguz.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/fotasejuxojor.pdfIn PDF document text
    • https://signika.pl/Upload/file/4001053633.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/basapewazugonimipuja.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7aea8044e---jubeluraxevubob.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_off0000c81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 11460 bytes
SHA-256: 6bc5894f6eb92c93be7b4cedef7ac48123650ced4c462c63ac6bb7b91b473094
font_02_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 16932 bytes
SHA-256: a39c2cbb670565f3d642bcfff25db368aac3e63aed1f8c791d17c3aa7aaeb7ce

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