Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5baf8ab45b5964…

MALICIOUS

PDF

105.6 KB Created: 2021-09-09 22:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f510c7fc0c231a662df32e78c88fd3d4 SHA-1: 374cb4596199eced411a26e1c5e2a2d26afb92c6 SHA-256: cd5baf8ab45b596447453e35b44f6d99c8bb22bb00d83d28121a314851e0a51b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to domains flagged as potentially compromised or disposable, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users into downloading further payloads or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://facyt.com.ar/ckfinder/userfiles/files/68750448364.pdf In PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/57857432065.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec25caf36---54178988193.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/puwoxaw.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/xapajuxawexosabapazubuw.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/28686330379.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901223753628152.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/10715445568.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/74845080726.pdfIn PDF document text
    • http://wohntraumgmbh.at/sebutewekijuzip.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/39770827120.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/86769721782.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/90929980212.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/kasipenodisegewuvo.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/sugage.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/lenepanejulurejuxizira.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e177723721f41b1a704f982f6b92d1d1/30637736494.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/metorelazunawodenebun.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/dugigawotikibozexuv.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/22495166599.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/56086349766.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/191267854.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210902023341_3wywcy.pdfIn PDF document text
    • https://akconta.com/uploads/files/bejomuvulaxexufarab.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133536a51301---83006181722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fullmetal+alchemist+manga+volume+1+pdfPDF 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_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC4 24172 bytes
SHA-256: 561120a713077ff398593abe11cf9846f5ba303e7c99f0b92d22c8b64db9837f
font_02_sfnt_off00017e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E3F 11160 bytes
SHA-256: e85b07f50e41c971e8c3878fb1a820a1f32b7b946b6a9b9889e981610860e6cb