Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51e4ef3d92cdb5e…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 13:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4a3d0b25ded8ddcf0e95f8976e7a828b SHA-1: 06b0a96b8be9200c85eeea8afd208f8f47f4a57c SHA-256: d51e4ef3d92cdb5eca4adbadbcc24ca7470f6f0f0542ebca089da0eb73232091
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host these redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=the+new+world+order+by+a+ralph+pdf PDF link annotation
    • http://www.addvanceo.info/userfiles/files/zawasexorisojujosizegiven.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/jatel.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109052256558042.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/sibadefilu.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/pobosunab.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312b762dc81---nebawisofakevi.pdfIn PDF document text
    • https://togeltop.com/contents/files/56376373678.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/98377298770.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d829d310d0---78857283394.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0d93e452---vuxosidomemobilutiriwe.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/27577880609.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/gukisosusalaxugas.pdfIn PDF document text
    • https://cityface.cz/res/file/simuzidibuzilemixebo.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/radodo.pdfIn PDF document text
    • http://voijin.com/userfiles/files/93442506149.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vejuwigepofejigopefig.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/75708854951.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/m62jr0946t5gtfek2j14f3bbqu/biwan.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109040053013145.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/17761289879.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/gatokuzeresex.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/15755561488.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/59477917647.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_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 10540 bytes
SHA-256: 3811731866f84d589c07d5bfa7ba246f106ba1b9ee5575a5aa004f422e258f8d
font_01_sfnt_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 16052 bytes
SHA-256: 52d5d1aac8e6701d462905d6b2af9b7b5e5dfd539c1bf27816e295242c3b9c58

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