Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1f4d84aff3730b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-16 09:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d124bfdb9f9ec196b94bcc3086705285 SHA-1: b5385ea0c21345577dc4ffeda769d1a67c6966e4 SHA-256: 8a1f4d84aff3730bb2d0854f1a4fe7e5369717ba81c5a0e71c62582a1392675c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://wastran.ru/uplcv?utm_term=virtual+space+for+android+10+pubg+hack PDF link annotation
    • http://abwplazaview.com/uploads/files/94813630444.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/pebasizisurovalugitor.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/zolesox.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/jirokaxavigimiwumuxor.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/gebovebojib.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/6382886677.pdfIn PDF document text
    • http://air-ned.com/uploads/files/97143833932.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613609e68a098---baxuzimu.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/68261679194.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/41848837566.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/58051368175.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6f35c75e35bfa6ba2043142dd9a0f8d1/13888927621.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xidawuzosaxejigofiwozemi.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/26076952460.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/681sb7nua5333bjj5u0o62hlv1/kigiterivujimepaba.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/76160077328.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/gusal.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/labulebogigafolukezixutir.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d43b54e3---98315625925.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/99258556134.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/epgqs98rbqepi3essafo5d25m4/sadalasuzagerow.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/36777649479.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/xegejigapu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 11372 bytes
SHA-256: d74a204f010b974b33581b9a8eae281c988045e0a6b1bc82a87d6610f6cd9452
font_02_sfnt_off00011800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11800 19916 bytes
SHA-256: f7682e7a41d4a82801b8ae9bcce46d089b41508d3df214466bf64a546e18c5a4

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