Malicious PDF — malware analysis report

Static analysis result for SHA-256 3daeda520dc0ccc7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 00:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13544320c1506f5e476eb770b8007136 SHA-1: a0f6319f11544c487f33bfc31097a2841d4085f9 SHA-256: 3daeda520dc0ccc74b6b81cf8a075f9663d5f0fb9a6de3403d340ba991fabfca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to artificially boost search engine rankings or distribute malicious content via a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=list+of+five+star+matches PDF link annotation
    • http://cleangroupbd.com/ck/upload/files/31206363438.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/71430977916.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/54861025236.pdfIn PDF document text
    • http://surausa.com/uploads/files/gamotesugaj.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/pivotosadejadisirot.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/femupolupomuwaxojatenedu.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/lajozejeguvet.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613720197e89b---3506879802.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1632015897.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/sexeken.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/diseso.pdfIn PDF document text
    • http://caramelitos.sk/files/koxurerudesu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eaa45b7d8---51578802923.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/37137672950.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/61624150375.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tufoletofesunilivevatur.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/dejosugotozotuwuwebe.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/86845900608.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210915220932.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/60497721658.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/82045287860.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/87053921076.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba79d6b301.pdfIn PDF document text
    • http://lg-palette.com/upload/files/kogobojewufura.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/dovozizevimokoxo.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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 18268 bytes
SHA-256: d3e9f6c0cb9a077ede4883b214a612c01e159ee49834b4e7c38d574265e3bd36
font_01_sfnt_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 10472 bytes
SHA-256: 496cebc19778ecd8e44c54d019bd40740d302db78cdf3eb27a44be6a38a3fc11
font_02_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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