Malicious PDF — malware analysis report

Static analysis result for SHA-256 276af74850287855…

MALICIOUS

PDF

74.8 KB Created: 2021-08-28 00:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 987f593abf2df7e08e322c370b216f8e SHA-1: c49630db7ced8853d753c53b797b116d3c077c88 SHA-256: 276af74850287855e54a4134b0a1be9cc6b61adee9fe53e27b5da2ccd25d533e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=pericardial+effusion+meaning+in+telugu PDF link annotation
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d615c189bf9b604f87e9a4517303a5fe/70524736765.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/kikazetokiv.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/45186426642.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a1d5c7bfa53c06ea151a786755d0a76c/82033850829.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607294a1a30e1---wenepulud.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/20785511121.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hdgkb8r4upoce602o18p4vf9ib/67057629211.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a08455637fc---85017398788.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/zederos.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d551a0b8d2---82392145240.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/vifiburi.pdfIn PDF document text
    • https://theurbanthinktank.com/files/fekipedofazopuwarazitosi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb10f23fbd8---nexez.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/324fd55bc429e292d41fffebd71fcc2f/begodizosonalifupajidoji.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/98579239124.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/96013961063.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/petup.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/gidolabut.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/ravikijivoxikisalozemibo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e47a0d583fd---bovutezoranevogamuveren.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/37b9e5b6dc51890fe19170f88773d810/pameletutufuga.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2cbc6a5d9---42679504831.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/188075609466dd14e256710eea4c7077/24663818396.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_off0000be42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE42 17968 bytes
SHA-256: 24d204cdee81849038388b920dff96246a8024793a3fb57162d2765a265cda11
font_01_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 10920 bytes
SHA-256: 4e35899f0bba56cdbf3bfe37129971c09b8bc5837698c7252763d8c3d47a8f27
font_02_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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