Malicious PDF — malware analysis report

Static analysis result for SHA-256 b333f74d6e30494c…

MALICIOUS

PDF

186.3 KB Created: 2021-08-09 11:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ddd9599c134cd69bd47da1441772177 SHA-1: 403795f918e2f6dae7900d325bc144b8571f2175 SHA-256: b333f74d6e30494caf27f61b55f0f1e4e6a96276600dbfc62ac285b8d7f50bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF's structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://youandisagenix.com/ckfinder/userfiles/files/nuloledafunu.pdf In PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8972097f0b03d0c6bc12c5659b82ee87/rinogatekexikuj.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/watefugidoboselobifeju.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/dadazarelugame.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2213f5dd60711c6152e440e51d9ce105/besubetesad.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/64214628689.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/5bba58a27492decdfe2c9fb7d90cf0cb/46592589632.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad3078fec0---3544825845.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/41746485380.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a04976ac---gelubomokawukimi.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef83870fc5---pubufawi.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/57361941274.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/67tajl7j43j38ver8hk4l8059l/zokuxeberodazosexejulewu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082bbea386da---68110316331.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850c8797e2---89533187382.pdfIn PDF document text
    • http://kme-kme.cz/files/file/woxosi.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/10542239140.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/82227545604.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/lumikosolemoloferozuti.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cb3f9ef770f7f3232fe000793d0b8ef7/22807665036.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b3a711f462690450bc656510801a65fd/12959244367.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/35286583836.pdfIn PDF document text
    • http://tythb.com//uploadfile/files/poredufizavitutof.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ddcc7d964---julixolab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=transformers+prime+jack+and+arcee+love+fanfictionPDF 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_off00027acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27ACD 11032 bytes
SHA-256: 60eaba241f821c5e79ba0e304536b44dcf210cc3b405a64f6ff902ab610d540b
font_01_sfnt_off00029474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002ac86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC86 16944 bytes
SHA-256: 5beedf766c48aff03c26b688149708033612322d299aa3c6ec3530aea2b0eb20

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