Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d84b5008fbe0729…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 08:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4b64f80bd5356cce66fbdb5a6e4d1de8 SHA-1: 7eb0fd0f4edd50604b9b18e532b101d01419a09a SHA-256: 4d84b5008fbe07294b71cd9f9058b8ebe647d7b60b37c59e28305827a7c790d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, several of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://jewelry-shopping-city.com/uploads/files/202109102208553194.pdf In PDF document text
    • http://okfilm.kr/userData/board/file/72946952524.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/93342812089.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/gigot.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/22714449193.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109072312237196.pdfIn PDF document text
    • http://alltechsro.cz/files/9658267849.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a944f4d1e5256e6af82ec7aba3068091/wizaxe.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137663597e4d---bagapepamo.pdfIn PDF document text
    • http://teplospectr.ru/images/files/99571338452.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sugejusaluwapus.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/84019734586.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/86400913921.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/gupupibavureg.pdfIn PDF document text
    • http://boki.hu/editor_up/dedap.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tajewininuxojo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1f52a6db---pifomutamibo.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/75108348946.pdfIn PDF document text
    • http://unseretochter.com/images/file/fanudev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reset+a+phone+using+a+laptopPDF 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_off0000d2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EB 10708 bytes
SHA-256: fc79f55c54e6bc337e74b12d5f43ea02d1dc8fb460d8ba9f571c70a0a01c4ea2
font_01_sfnt_off0000eb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 18332 bytes
SHA-256: 63ced9f2e515b8bd2d8aec72a38757bd982bad8e01371246f98fe0e70097759a