Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d88575d9773824…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 21:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14ab003766ccd8f54ae319d126cfc7fd SHA-1: 91baf5ea6649ad4adf854190ea02ef5e40a76fec SHA-256: 08d88575d97738244e0c7e91b75db6e258d9dc5201917c7790c9e9bb1ac7aad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dailitara.lt/bites/uploads/file/gamukowoxagotami.pdf In PDF document text
    • http://c-six.it/userfiles/files/38616100267.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cbe1f2786---jerusefenosazofapezotan.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/87239355006.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/komevemoluneg.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87a3319b5---91127943799.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/53772080664.pdfIn PDF document text
    • https://olterus.info/contents/files/koxojumivanewijud.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/45952264107.pdfIn PDF document text
    • http://wdnederland.nl/file/benibetib.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/48999436577.pdfIn PDF document text
    • http://sparkpro.lv/content/file/56931292141.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8d140d3165ed70a264d2ec1ff720e5f/dagamatikiselemunanesadu.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620765969.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/2766536084.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8550crcm4sbfif6q65e4cd5pev/92135940277.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/36485166923.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/vulimuwevowamowabavejof.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/janejidavolexevexod.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1281552a6---tuxebelezunalugewusado.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/190783b1341da9dd9b92c778b26eaa4c/31741706908.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608db01e71f5e---ritosotit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+pdf+reader+64+bit+windows+10PDF 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_off0000b829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 11136 bytes
SHA-256: bec593d57b82d67ed628cba245db8cc649d603c40b4660f89107ab85700ea35a
font_02_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 16328 bytes
SHA-256: aa052e719e63405ded5dcc5d44b511a1acbf4b3f91b0dce87d03b09dc4e3ec62

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