Malicious PDF — malware analysis report

Static analysis result for SHA-256 463c46ec505f8040…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 10:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f44e40168ff8172a64a3798f76917bf SHA-1: 060fd1938668e45ca41bf4abbc81e3c7048c6c41 SHA-256: 463c46ec505f80406c5d654a8050e0c30854102f2ef67af0481007298d93adfc
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used for phishing attacks or to redirect users to sites hosting further malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=what+does+no+rooting+required+mean PDF link annotation
    • https://normec-cm.com/ckfinder/userfiles/files/87382145631.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/kisapaz.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/37348709167.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/59245086682.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/lijevujebalovokubaz.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a5a67f0fd3fe8ca788681d1bf78f4956/dozutozejuj.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/bewomerinunemejutuzenifap.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/gerupodigonesofupudak.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b5d6df32---38892678947.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/64434176600.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/16172220581.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/97668196016.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/pazefewimopix.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/gobivigino.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/vijulejalamowaj.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210910114929_788781093.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa517b40f---64429446810.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/80393811742.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/30305096692.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/gokibutiremupigivesejifuf.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/66549270311.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/53350356144.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d59d7de8f4---72195401021.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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 10888 bytes
SHA-256: 24575bc80eb12663f1783a38a0230eebb9c722db7a53d4c9722417601c67dd88
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17612 bytes
SHA-256: 9e7232e23461a63ec8e21987cc38f9af94a66c6e8cb39864a0851d1dc94c82f5

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