Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc550bc6bbd837b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-29 01:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6a9e611fc754f12575331fefccb3e9a SHA-1: 6f48833c8941c69ee4adf238b1fc717fbd0f1e02 SHA-256: dbc550bc6bbd837bc5daabc5c2361d63fb6e0fc35c9737f455c871493d3c1f13
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wedding-photos.cz/userfiles/file/totanavafunod.pdf In PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c1f33803---fezifofo.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/76541028617.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/ribogurametotetizapex.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161427b2c0f61c---15270019113.pdfIn PDF document text
    • http://klaaswester.nl/img/file/vuxuteke.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/25be67be169b6d9c93742a64d932165f/30134311162.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/54320746233.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16150392e4cb9a---dupitaw.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/58937390895.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/venovesigegijizax.pdfIn PDF document text
    • http://chinazzjx.com/d/files/kifubam.pdfIn PDF document text
    • https://mackbeks.com/files/file/pifurowufijokizufexexux.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/66349298525.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/31772751606.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/90501356351.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/97303997271.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/gozapubeb.pdfIn PDF document text
    • http://cobmedia.hu/include/52268168228.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/badozemoz.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/75569795317.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/12566075619.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/lumelefuwiro.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6cfc9eff091942faaa2dc7978966fe97/vivonopuruxuwuzezuvikuk.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/xurigagosazupurageki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=kimetsu+no+yaiba+kissanimePDF 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_off0000bab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB3 19516 bytes
SHA-256: bb69b3a7bce70696d4867c04af92bdf500ef027b99bfbd01cfe20f699f30b229
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 10560 bytes
SHA-256: 459b3896c700d4bb0f0f6aec4652c45a8ca26e8c6b08cb0091a9a526fbd6773d
font_02_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1