Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e94aefd8ff06b64…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 05:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a56b584dd32faea63ca10da3426f4a2c SHA-1: afccbc8a34d9480b9447b95ffd6730094f195a18 SHA-256: 8e94aefd8ff06b64c671cc26d1d2dff9922d4f6f31c5d1490df8f0a50a412725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://defhjdrjioo.friend-match.com/upload/files/ninalupinagerejunotepe.pdf In PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mesodalox.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/49462085601.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/ledijevalija.pdfIn PDF document text
    • http://one9five.com/userfiles/files/vizafomiwupumijamosukesuf.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/6076863862.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/44681005773.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/26266577685.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/63389229608.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a6747419---99855450415.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/bolexopureka.pdfIn PDF document text
    • http://parfumland.sk/upl/rudujebuniwavofarudif.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/wenujula.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/79804350544.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/14075369773.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/talutewijowadili.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/bobepebopisares.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/30369273900.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/raxipozer.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb9398b3b---84517982249.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/72134768043.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/51632758631.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/kinunibaseji.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/xumexujodefemozu.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/zafoxaka.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b8j9fp52elfbmd4rjs6kvtirvb/devaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=music+album+downloader+for+androidPDF 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_off0000ea2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 10860 bytes
SHA-256: e09be85660086783389f4050f8df8ba612893b51bdcf78ae39ff6a52637556cd
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 18676 bytes
SHA-256: 17da581d813e359ebe96157014517e417bd15ac3f5d7304d61f0f3377dd6ea99
font_02_sfnt_off0001337b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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