Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6adc30d08b58d5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 13:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2763d24c64304dcc76c5606762a6359 SHA-1: f36b83d785a7b6c8688a432604e1eb37a42b0232 SHA-256: 4c6adc30d08b58d5130f74ad2bc0ed445a4dda99f03b3a8b4d9b3c5d1082b7ee
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary attack pattern observed is the use of a link farm within the PDF to direct users to potentially malicious or phishing websites, leveraging compromised CMS uploads for hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a16e804de6a29006e3fe6f990daee870/wabifepixesedokutiloma.pdf In PDF document text
    • https://bestcoloringpages.com/userfiles/file/41356680337.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/wizepubodapi.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/31657668350.pdfIn PDF document text
    • http://berbun.com/user_img/file/22017424839.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/40009853274.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7f890c22dab5315afd4c7cfe2a3afeb/sapanikasitukewates.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/94515691172.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/367b578737442ced0ea062d7d08aadb8/wuponafa.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/95640552280.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/11041601676.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab627f626e4---pamim.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d03d6cdb---34263384457.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/sisegi.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/buwazo.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b5395a11af2bdc3d48cb320c3ad0ca10/poxawo.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/govazipoketopadozeb.pdfIn PDF document text
    • https://defaico.com/d/files/62877531086.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/81577848474.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160cffba4efc91---fobelilux.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a959934f31---17698010700.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/te72i4t7gkoaq3v3ho5jdfv0dk/sapogukipegogepakosuxok.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610d45a04cbf5---71856882778.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/92957351815.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5628ef47e---bofelekazeredaguxexupawup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=converter+pdf+em+dwg+online+freePDF 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_off0000bc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 10692 bytes
SHA-256: 82bda1e8b20788560d3e69c658686c87b9de0f27d070fdf1dde853cebfb62167
font_02_sfnt_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 16784 bytes
SHA-256: eea9bc46d2f7dd0775bd998880e7eb2962d26bb32901b50b6776cfd0ffb20b53