Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c89524d7bc957d4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 10:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 70d85a502824ecba8b17ddd7b330a103 SHA-1: aff350644ae211c3cf46bb7208dfa4ba5a6a6e79 SHA-256: 4c89524d7bc957d47dbdb2466c226accc32423da26d21716e7f538c8c9329179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious payloads, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=moto+e4+plus+new+version+update PDF link annotation
    • http://taxiluzern.ch/khurasan/userfiles/files/zapezupa.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109091428277803.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/82194165118.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/79804458684.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/66909818294.pdfIn PDF document text
    • https://micsys.in/userfiles/file/2149129902.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/64775823126.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3605b6147---37789711898.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/jimewutojapevibitor.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/83581208989.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/71888826955.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/eebfe9c2dbd2caeb6148621a3664c87c/9618639927.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/38481731236.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210910_808872C6DF88D543.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/dowetodirepomezezituniwi.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/xoxizixazas.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/53239520911.pdfIn PDF document text
    • http://elskenecologie.nl/files/moguzujavanive.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161360a51ba082---66377932745.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/81307644542.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/24115087385.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/lifudov.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/sopasavutemovafifefexerer.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc1d8edb1---milezepowum.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc050dfc2---wifodatubes.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 10708 bytes
SHA-256: 7d0146aba264089c5ae0a155ab0809b908cac30bc5072a1678a07d84d0448ce6
font_01_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 18084 bytes
SHA-256: c72f2beebbe4c6909703ce05449205fa6d1ca418bdf27cf2fe648eab64e5ce71
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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