Malicious PDF — malware analysis report

Static analysis result for SHA-256 477443626d0387a3…

MALICIOUS

PDF

79.1 KB Created: 2021-08-13 00:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b0fbaca5849a18a88c2d4c8747b0a938 SHA-1: c849f239af8e940e52ef910551b5b526f716f688 SHA-256: 477443626d0387a3244d34450c412fa8e3798952833ed93905269915e97eeb58
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports the intent to trick users into downloading malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=vapour+compression+refrigeration+system+pdf+download PDF link annotation
    • https://motelandratecuci.ro/userfiles/file/lanekijeterebu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/donaladifusejegiwok.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/93231640014.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/nijapexujafilisarop.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/pajv9qu4lsar6vgd48603mattb/45671451543.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609746677a80f---kimul.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/esfjj4cemd4lkoplmcn7b26ir4/97677002925.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/35536403070.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/36k4oec9u05eoiv3ormodistc3/wigavetimowudi.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/05a11910cf8bc1c3374758e40b94e4e1/58095412275.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e3840ac17d8b77971f98776063d320d3/9492158210.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/puvakosoketepotatikaf.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/luvimitidizereri.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad4d6fac2663e7b585ad57725e8d380b/zuwebetilomaka.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/57914685947.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/wuxexuva.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/37p1vo8dna6l2mllo9ejoq1gh4/goxajukakejubimazali.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210612005519_2jygyy.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16083e26030ee4---88133656257.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/fulujopugezejop.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c441178c1e0---tevozanazotezumuredafe.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/bubowuzuxebogokada.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/315f69a5e39cca9405ba8751f8b39a48/99976560917.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5f1273ac8e247c04770f1f09255d8508/volizupowonujuloronejud.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2e8744e2---leteruxotonawoziram.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_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 11232 bytes
SHA-256: c5ac0d45f843b21b40bf0953fcc10531e67001fa8974f35c3bd9e21330e2bcac
font_01_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001016d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016D 17108 bytes
SHA-256: 89f1982f09de95de29f98e38d87cf0e57945ea70bc0c00b853c1716d0a164179

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