Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c50f819edb1f556…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 23:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cded82e187b4a4932d085780ba46474b SHA-1: ff92d700d28884492223dfb1c0af448d105c0d39 SHA-256: 4c50f819edb1f556ef848021bd8156379c8014914ea130198ae6267c46ca5fa6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc3fa5ff3---89338285281.pdf In PDF document text
    • http://kiraat.org/resimler/files/34861761967.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mejemijanep.pdfIn PDF document text
    • https://actor-conseil.com/files/file/pikotidejiwozot.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/27935458963.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/folenanujikavuziminaguxa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b850ec3e59f---2596604296.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/baba47abbb01817f89bd4de053a5f724/96252153725.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/45f0e024c2f6b0ecf730b191bd327147/buwikedefupiridadudo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e5ead347afb3605d4b782521d9a0d11b/futoniv.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/kupubegunapijuwowuzu.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/zosebodivafafego.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/51120570213.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/87119770773.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/nutonasepobarojivezosusiz.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/93793018754.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210816103126_NTg4MDE3MzgyNTY=.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b272f1212ab---zaxare.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/fuxikutekinewumobisovevi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610f68e3f05c5---ropusikudib.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/wodezi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/20b778671d6de78f479a34068265d37a/sokinobenawu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6fc16d0fb19b57281f5502ded81ac543/pajubimegifoxig.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/penin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=struma+nodusa+toksik+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_off0000bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 16776 bytes
SHA-256: 74d8fb0743d7ceb62c34297da426c204d6f82c22e15281b550b21ba01a68fbad
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 10748 bytes
SHA-256: 75d1b7ed4804bb91510e0b1e92f8d751f69c0c355459fe0ff4c53220b950dff8
font_02_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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