Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f69a3801b605f0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 10:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49559b188b1863fc758f92f0e1323517 SHA-1: 601c6b03282086193627790d58f7fd2f4636378e SHA-256: 18f69a3801b605f0694f1bd7e3700f7c63458e49ae1ee4ee043b4faeadf95b67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://geonatlife.es//ckfinder/userfiles/files/siwidevukaxodadalumose.pdf In PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/rexupajemuratetetik.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/96948996294.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d239b894d89cfeb3085c94cabd1cc12b/95008475240.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ec54f71e042473292b5044aa2c054786/57398924025.pdfIn PDF document text
    • http://yongqingtech.com/d/files/sabepug.pdfIn PDF document text
    • https://tcremich.lu/files/files/45817269292.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/fajazijaro.pdfIn PDF document text
    • http://www.trotasierra.com/plugins/ckfinder/userfiles/files/zasona.pdfIn PDF document text
    • http://promador.pl/userfiles/file/7605103863.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ca17c043e---21713886575.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/mosuvowabebedu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4405d7f9e8---nagogerufabevava.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/xatasedunonamupiberuboke.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e78833bc949---24112395302.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa4fdbc52---62394054673.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755408403d8---81849562432.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/vomimekazoluger.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/wovas.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f1f187371---konajobewudanusuduj.pdfIn PDF document text
    • http://guchenes.com/d/files/8340841602.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210614_f28c4.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/64883060394.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/1257760058.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4af40b39b5---tizosisenajejixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=english+cloze+test+for+ibps+clerk+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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 11012 bytes
SHA-256: 33cfe14496cbbc0a010e7734ff04f1eced86111a3e406045d340bb233a286a71
font_02_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 18208 bytes
SHA-256: ea271eb0dfee11d3ac8800284dd63c50a62563eb6c8e5f2abe8648a4aa649661

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