Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b4ad3857378a85…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 14:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 577648569e19ef394a575d99aa7d0389 SHA-1: 270d03296e8fa10b445e55bc5c28043ca5619848 SHA-256: a5b4ad3857378a8576d3c614f60383786bfd116db640f5282140d717ebf47dac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload storage and disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to distribute malicious content. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bmcnx.com/userfiles/file/1678025034.pdf In PDF document text
    • http://axwelindia.com/uploads/pakakoxituropedif.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/mogeverojarinujibud.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/kutofelopivodopiv.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/xedinititikepizisofo.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/warurapamaripudalovu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26109776845.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/28255254540.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c71be6631f9---pusedup.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/namimekexofugeru.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/rebofasajozibos.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/77628616476.pdfIn PDF document text
    • http://bienbao.org/uploads/files/zekutesapapizi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5f93993b92366789b528707e8971f030/38459760064.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19a52885dc.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ekkbi59g4fj7nv7g14r6e1fi01/96461630197.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/2407857436.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/75390648554.pdfIn PDF document text
    • https://lesura.net/userfiles/file/lotaveluvalusavez.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb9c9787d---10699766733.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/0eig1mhgmurhrjab910mtfiu61/getaforova.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/kimaxab.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084a2d5edb4a---95592564974.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/51842908570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=good+morning+with+positive+thoughtsPDF 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_off0000d02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 16940 bytes
SHA-256: 8486ec01a4b6ffe2b8a9b36d859ea18e681dc10c8e2c18555ffd12200e429857
font_01_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001141d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 10924 bytes
SHA-256: dfb53c65a13ee61588331461b9924f17037098a54c1c701d968d1a78769aa17f

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