Malicious PDF — malware analysis report

Static analysis result for SHA-256 d892642906e04dee…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 10:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8eebabcea1adff35943ffdbd5365bae3 SHA-1: 6703b543601d81f7c5ae71451fcd51f5626bd5f5 SHA-256: d892642906e04dee5f8e83b9508e5f9c444b966c95d06411d9b7dadf7c5ed0ee
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The presence of numerous embedded URLs, many pointing to potentially compromised or disposable domains, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://techsystem.gr/data/uploads/ckeditor/files/goresosapurigita.pdf In PDF document text
    • https://naves.cz/res/file/67032836050.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613434a52bceb---dujusupuf.pdfIn PDF document text
    • https://tavio.ru/files/file/21312633822.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/lawuxopiromisiferi.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/lotosokidusujivebujuro.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/neladalizid.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/30405255427.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/13146543247.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3c83dda929dbac38921a49385cea0245/jevoz.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/59876751108.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/48569810872.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/bukapirokol.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/58870961606.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/lagedagamoxitadadedirive.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386b93a5e67---fajoxabinevufekugekemox.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/fbt5vn9h8s6rs7bmr9h87kmi6d/35620658127.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/37636292349.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/madudivaritoruxumam.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/61809854627.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/difukomivixusemozasikede.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/sigozazuzema.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/31783184570.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/jilaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=smart+cricket+apkPDF 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_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 10264 bytes
SHA-256: 5325c36cf96eff51509840591582349ffd1bf78fee701b58b5b997f81b788afd
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 17560 bytes
SHA-256: abe931cabfe5230855cd4c38fc80129e8961a343a6e5612c667f350b26336568

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