Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4d9d3b8cd346e3…

MALICIOUS

PDF

84.9 KB Created: 2021-08-15 02:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 058a09bbf6cc1c6ead0013a60e34bd6f SHA-1: 9b7aa15193919d2e945483c6b933f96084b63df7 SHA-256: 8e4d9d3b8cd346e3993f1df94ac2c6805ac88ba0ead3574221d24d4959869b5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://2478.ru/admin/ckfinder/userfiles/files/jiduwusevexizivuvonul.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fba45ae1d---sedafativovede.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5ba6f752---90847490229.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/14015779392.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/tawozovezam.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/25191349625.pdfIn PDF document text
    • https://giasutainha24h.com/upload/files/56837022412.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/458ea56370026b707f79bafd3a5dcb9d/demuwim.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/27706868259.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1827e257cd---wusugigavole.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b895cb547f---zejirasojafixirexa.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/vuxujexosiwiz.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/60915161183.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/nafivefurusubodopive.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ro54debfhg1i4h1ktc4qi2fv2t/13020615627.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c051910d9d9---14076113101.pdfIn PDF document text
    • https://giustofiori.it/file/56268332173.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/db85fba15b1b29d818a16408bce68d1b/76371760689.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210620_040016.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/17575014772.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/nufelulatowetibixa.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/12996157650.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/76918804452.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/15394754872.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eff18ad12e---57565762412.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/jiwubebukiwolakamibofo.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/nawovalakexeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=stickman+master+archer+legends+mod+apk+unlimited+money+and+gemsPDF 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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 11340 bytes
SHA-256: 916b70f52ab0d159b538834066562d2f5c3ef9951986cacb9df59bf056211ee1
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 16744 bytes
SHA-256: ac56f73216e95b17550bb16048dfb8c5139984ebfe050286c20efd6085296fda
font_02_sfnt_off000129d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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