Malicious PDF — malware analysis report

Static analysis result for SHA-256 e539bd7bbe3a61ec…

MALICIOUS

PDF

86.4 KB Created: 2021-08-15 01:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ee497dd8a5e1d04f43c4e391a50e349 SHA-1: 67c5cfff16abe0f0128b3ce399ef49d9cb3c43b5 SHA-256: e539bd7bbe3a61ec63f98654bfe0e785202b0041bce77cc140843a33ff7b569a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The primary attack pattern observed is the use of a link farm to distribute traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://almondzwealth.com/administrator/imagetemp/file/warezivojefuwekudu.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/pq8krmhrf603rvku9upv7bs6m9/bopinuxifubuvadix.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/57f5d843fba96f329f53a99299e5d4c1/sejiwojujo.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c83688150ad06f8701c4d3c77440fc70/malaxanav.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/31502829847.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6t67s5f62d62p831j79hmks8ul/88162752998.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfe783a6da---damugudar.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9f10c17a---pumafojonotaporigikopu.pdfIn PDF document text
    • http://llux.vn/uploads/files/sonasuwokefenepibisuj.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/bojimu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/28083881054.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc6970363---dolodibuzarejapip.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3v4nl1qu4nfokrluottvrll9s4/waravam.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/lifefavizulodijatoguru.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07dd7bc1b---3239417406.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bec7a469c26---satafikipijawanasugupavin.pdfIn PDF document text
    • http://naucseto.cz/storage/29604854376.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/82442674661.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/juzulusubovupowi.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/pogimadise.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jokovawe.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4038892c---zojadijulenakogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=oracion+al+espiritu+santo+para+cortar+lo+negativoPDF 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_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 17580 bytes
SHA-256: 0676b026465e01d3ace8a62fe43de34a7f6102c9ff31c39093cbd4d2d11f11e8
font_01_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 10740 bytes
SHA-256: a7102cfc66655035b09c378485c417dbe31e9ea060f27612e52a63b097624134
font_02_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.