Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1431db54af2a14…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 20:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1610b43053075d033c2960e5262c8172 SHA-1: 8976444fa6d5d24a51de3130d430fab66c81b02b SHA-256: 5e1431db54af2a148fbd0ce3f80c646a8d737df4f28b358c8069684f787fbde1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a link farm, with several hosted on compromised WordPress sites and disposable domains. This suggests a phishing or scam attempt designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://clean-ecology.com/Upload/files/nudoger.pdf In PDF document text
    • http://iccarrentals.com/files/file/1726560966.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/0tpqnnfg45nd9co55ggunvub2u/bakebofaxikuwenuv.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/43813818492.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/lurawoparoxupa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160971b2071694---76216349238.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/89909038922.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607628116e60b---59697492569.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a16dc5739---jedizelenewivorekizun.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/38060734959.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/pomefutopidakebogojoxu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee3a1362844cf757d9bbb0d5d9c445c7/fodonixifusanofakivanumes.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/98082907377.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609982b07887a---tuputu.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/nururesetati.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/gawilelafabu.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/toluzebuku.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfe170e504ff1744187cdaf0002e79b0/5589191813.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/bulisesajunitatosewej.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609188a8d7b2f---3694946416.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e33c7a5d2---11192555762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=six+sigma+esbelto+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855c4531bed---fodubuzak.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_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 18920 bytes
SHA-256: 1032e0336b9d1c8235146d72da41e3bd2bee08af54336371a37e18f5709caada
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10952 bytes
SHA-256: af5522702c56ec146737f0c2b2370a776477ead577ce73ff874ae6372f1aae78
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1