Malicious PDF — malware analysis report

Static analysis result for SHA-256 541895f8fbda2f49…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 10:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8baf57a2b296a7cd448efd8d91e3171a SHA-1: e62acd45006c0fb4f6927224cc17e9ed8163f24f SHA-256: 541895f8fbda2f49a8e2df16fb98d3c47f6871f341db87288427ffec57bfb6e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/vsu0pui6tee4i90mhvibd93v0u/tovarufipojuxolifajogez.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e89da2fc9---titipux.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/nitume.pdfIn PDF document text
    • http://contelex.it/userfiles/files/bekubujovot.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/7331670344.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/26482226326.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/88781020513.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b02277d2aa2---5074777259.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6vl8sal53tu8akft1sm70dr7nh/2694211712.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111cfa587242---suresumuzabebaf.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d3ea6205404da4afae2606bfa17b07ed/mebafodokopem.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/91685266059.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3615f5f2c8---29535279452.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809a989613f---7762845395.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/41122425249.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c29e4226b7d---liravosare.pdfIn PDF document text
    • https://efnnma.org/files/file/puxapojobaxupazizepemuki.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806ad4adbd4---kigajajizonu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fe6e1454---pevixakuzekunovelijabiz.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/9426059075.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/95100408428.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb231543e3---80273338577.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/dugumadaza.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/82098839047.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/53403979983.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/89810112443.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/3979696972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=somatic+symptoms+meaningPDF 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_off0000c1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A0 17116 bytes
SHA-256: 3986a67298a7b7a7688cf0299ca9b72c702d5ae3b00fc3512d54b365b2ef2e83
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10760 bytes
SHA-256: 3f43e81dc8bd08afeddc8b7e5ce0b59ed247340bf4855fa79a4d7d4cf1f65b34
font_02_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1