Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b277b2e15f2c5b6…

MALICIOUS

PDF

89.0 KB Created: 2021-08-14 11:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8314779956ffbf7ca16c1f1a135d9b05 SHA-1: 89ea63123be4a4ad856ef955a5bf214740f1f9a5 SHA-256: 3b277b2e15f2c5b620aea7bb603da8d8e1c3dad3eb7e6bbce5514fb28226c7a4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/ritaxu.pdf In PDF document text
    • https://pmfegypt.com/userfiles/files/57341190424.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/62328711873.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/watikitofon.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/62259438543.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a41dce97---49732327573.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/29012943068.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d06d50ffdc---wetenuseximojunagif.pdfIn PDF document text
    • http://ccadl.com/files/20210727161137.pdfIn PDF document text
    • https://csodamalom.hu/files/files/gasevadadewaxewunigul.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8f4e35850c28f2a5c1914b2abae94467/jojalolopajajanejazoxum.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/682d5028b9c8c036c8c8687bc94fe68a/loduzoriromofavapinus.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/86764532462.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73987157562.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609efeb40a5c1---damobitu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46359105f---ninupigogedig.pdfIn PDF document text
    • https://actor-conseil.com/files/file/26172925563.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/78500528747.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa5093380---77190174959.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609924cc693dc---kitejopedipuluzin.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/970661a691c2b7702c2b98958f9f17f8/zuloxo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-22/20210722171411420020.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/86486518120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kirkland+stuffed+salmon+cooking+instructionsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ae34a41060b3d2a3d74908aec9c8368f/kalegipigug.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_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 18204 bytes
SHA-256: acc21c5203b3812b1b949ff8cdabf473ba1eaffa3094c53cf50f820877c2b7b3
font_01_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 11000 bytes
SHA-256: 8a8398dd6840a6f665407ebb682b916d747144d71e0c405b3a0257cdb36be75c
font_02_sfnt_off00013d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1