Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44ee6eba9987743…

MALICIOUS

PDF

85.8 KB Created: 2021-09-06 18:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e6ddebddefae9902494a61192d01352 SHA-1: 23d5444492b37be7e950c89a7642bf44a89ec50c SHA-256: d44ee6eba998774340468a747d3cfff71a84c76790f24f1c825dbe8729fa3348
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.sas.edu.mn/ckfinder/userfiles/files/bipoxebopuwagowop.pdf In PDF document text
    • http://farmaciafoglia.eu/userfiles/files/fozoko.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926a597105---rarexe.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/d56c7bc1027305f4f588e141002f972a/18670458911.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/xumisevatitetuwesem.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/lilurew.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/zinis.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/40999314394.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/gawexovexumuviwukipaduj.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/40469234711.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d3b9b37e87ec0c36696c2d4e79480983/detezadiwudegutoneko.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/rusivo.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/roxugejezirobetudefofun.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/pifubu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/42390326431.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f49de6cd4---tawaxuv.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5d351521---zitegijexizofodefonopo.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/7995575979.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/14262857323.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d69b61eba3---78276434151.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/25487588427.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/goeuhcvj78jnjqop20nl5e2teg/17632185220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=frecuencia+cardiaca+neonatal+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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 10524 bytes
SHA-256: 7d2c11e338881e28f4e3d73befe9d2a5fe96a5d21ae758e7e687152f824b4dd6
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 18412 bytes
SHA-256: 42d73119116f3536dcdb73b80bf2188090317b752056bd43a3ebb354267392f5

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