Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee5f03a6e35997c…

MALICIOUS

PDF

116.6 KB Created: 2021-06-26 03:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef8a60fe269624b1ecaf11c13005c025 SHA-1: 3421cbe30a0b849d8da2b71a029fe7887744638c SHA-256: 9ee5f03a6e35997ce159d8adc8ac10bf0229205addb453412e16d36c9a54f9b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a lure for fake invoices or payments. The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to facilitate the download of a second-stage payload, likely via JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://sugarfree-gelato.com/upload/file/suroburarebupukatomupano.pdf In PDF document text
    • http://goldenpeak.it/userfiles/files/31181109802.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b48925842e7---34023753020.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/rukazotonaponatatexa.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/11422038347.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/78651114078.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f1acf89a---79533970992.pdfIn PDF document text
    • https://mahae.hu/files/files/62778360162.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210517094917.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/96594120279.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/dio84sem4kif6gv721h9ie75v2/gokokopufad.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a7d2a8a843e4eb2d79e89fb8ee80ddc5/zopidavajeti.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fea3781fb2---rarifaxusaji.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fqsgqgvc0e40dspmtbjm56e2rb/15305050648.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2afbb77b173ba2c72d628f9cf1bf93fa/71374765008.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/6502658215.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8e1f6c38461a58fef08354b543920a15/74596394895.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/90208493796.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d93443db8---32065548948.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/24943372694.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e39d91179---piduru.pdfIn PDF document text
    • https://luminex.pl/upload/file/54101588321.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tnrdbn1gq3fo3rokodp0dp2i4g/26992277905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mba+operations+management+assignment+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://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_off0001669e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669E 18016 bytes
SHA-256: 89ece3a53ee751aebdfabfb347672c405271443f9d7ed2385df32d617184fa0e
font_01_sfnt_off00019647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ae5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE5E 10928 bytes
SHA-256: 37e7e8d375052f2e38bde3b889401ffa56a0cb4d0ed9a7a95a6dfb6b7b2988d7

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