Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae4e4873558d242…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 15:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f0a20db0529f7e5249ca5da136f6579 SHA-1: 411a64ded54ab19a648ebb248e53047c07be123d SHA-256: 2ae4e4873558d242d0ea4a98772d76fef0b5ed539013cfc6be69bbbe1de3ecc9
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these link farms strongly implies an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hart-metale.pl/gimnazjum/userfiles/file/ruwufakibukavenubukajomaz.pdf In PDF document text
    • https://noithatkuongthinh.com/uploads/files/lurojesufegega.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/dolepupogudonirupeto.pdfIn PDF document text
    • http://intergeored.com/upload/File/kozonitizamorozuxutan.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/24884425465.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/91624427129.pdfIn PDF document text
    • https://sharenkon.com/files/vavokum.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63775b3705---97741258724.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/h4rdbo48pfedt97bruo8sa9e5q/33366052824.pdfIn PDF document text
    • http://indexone.ru/upload/file/24195500863.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/83n9rgbduqekgnin3er3quf316/34049287390.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/45153260830.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05056766c8---xoxevitulosef.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/gimatiw.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917ea0489e5---bukaj.pdfIn PDF document text
    • https://blv.by/upload/editor/files/51717598654.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/44928831256.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e7c836e3e7e1d6ccb125daee3ea00bd6/zagasabenoxepalubo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88969289e---wotexeb.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0lhij2om8vn9jadspccv3o321i/99804527532.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/16044705172.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/24042180112.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c315471fa4---ninodoboso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=online+blood+bank+management+system+project+report+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_off0000be09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 11464 bytes
SHA-256: 3975813edf11bcd40190d65c2776c0446db3062ca323a27eebef78fe3f20befd
font_02_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 15704 bytes
SHA-256: 4cb9f027c0aab95d81643f4995a7facea49066faa61a70f90616c5bcdf622731

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