Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78b7057fc2d3adf…

MALICIOUS

PDF

81.5 KB Created: 2021-08-30 21:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f384e51b0d32d59817c647613ad8db3 SHA-1: 4b6128a8fd4a7b2470163b35a11c9a5081a53242 SHA-256: e78b7057fc2d3adf1351939aee8301df2c20175f9f2dd212d94c0c73f03a7366
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 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 https://thefertilizergranulator.com/d/files/21890277877.pdf In PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/munewaruxurepalenufiw.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607146fdeb55f---fapesazixefomupixor.pdfIn PDF document text
    • http://babamoleskine.com/files/file/kujidiravoropi.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/3246829398.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095549829178---nuxubinujizid.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/lujik.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/24139906369.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/94069313784.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ae3fb04d6---noxozawijovusu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/b0sd8r6cijl7h6l0tvsj5ko492/kuxikovejapolofoli.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/kivuvedagitotisisafidoguf.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/82299005388.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3919003c---raleborigefojuxewibi.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/76433543824.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/41524921636.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1217f051c2---85603566504.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/g8s59ph3objo742odq41s9ac2p/89302461994.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/35565588899.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a804ec43e26---gafoderafawasexiduvizad.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/woralexurutetezawekegaro.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/52700248797.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6d857f33---dupefumawusefid.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/winerewumafolebogewa.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780db4822b1---79784649436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=running+stretches+pdfPDF 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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 10716 bytes
SHA-256: 075df8615a057a4f2e952b70f3cb7ab593db54a298f771323f2bca17d028f888
font_02_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 16968 bytes
SHA-256: b9623bffb563ccf45bbab0e1dfea1ade8a4858b548f9dcedca43ee5ec8f6a78c

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