Malicious PDF — malware analysis report

Static analysis result for SHA-256 943764de63477fc4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 03:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14182deed3a60b6605b8fbf4dde147dd SHA-1: 258a15e4ece40d50e124a9f22dbcd21080a1afa5 SHA-256: 943764de63477fc474ebaefd0d48894fb76592e6d41e3e40bfbb5921f46cddca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hiniceshine.com/upload/juledujex.pdf In PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/60312031638.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4f6666649fa88905ed1ba4b2d52f430f/30586702856.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/sapudokevedasibaf.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/tozubaxuj.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/61689549862.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/93306556600.pdfIn PDF document text
    • http://sbairs.com/datas/files/jiwapenuxakazakotafepoba.pdfIn PDF document text
    • http://classtool.info/upload/files/74089778642.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/85346452402.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/junitifezixarolowas.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/kawuvudujuvulebogebudirip.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/ledulerozetifajodalu.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/87928351025.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/7594581831.pdfIn PDF document text
    • http://vln.nl/files/file/fodosijigepobusulimepa.pdfIn PDF document text
    • http://methese.com/upload/files/nipap.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/sixapatapa.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161342703a1604---46619369323.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613db980c0ea7---matebokubowutulapofax.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/76655762246.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/chtg0ldnajlr44c9m1si1g8a2d/vimukedalezoxaxopuwesofe.pdfIn PDF document text
    • http://kmsenior.org/file/files/nerarodezuwaxujibekoto.pdfIn PDF document text
    • https://agrando.cz/files/file/sirafodikafuler.pdfIn PDF document text
    • https://eetravel.net/file/15757346812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=funny+words+that+start+with+yPDF 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_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 17944 bytes
SHA-256: 51c98f72d42aae6733e035008f8d92eea9695b11bd80bbdcd08d980b4db21220
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10444 bytes
SHA-256: ff431ccf53ca7ff440f8eb8b15825e1aebd22a4c18fb7f2609f62c71cfb334ea
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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