Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e746daa9413faa6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 18:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 789f5185fb8ad8210fe8fdaf18a1df25 SHA-1: 4ce3d298515cf1ca765a8eaa04fcf6e3d0ce35e7 SHA-256: 1e746daa9413faa6ccf3260df92d4e657f1e2273feb24ffef146e883679ec34d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zekidilektekstil.com/images_upload/files/feseduketifurenozokukam.pdf In PDF document text
    • https://mabuksusu.com/contents//files/gazaluketuvorapini.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/lakokopaduxij.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e1918481d---zawuwobe.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774907411f3---xukalodubuzijiju.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/23686662839.pdfIn PDF document text
    • http://schokofontaenen.de/idata/paduzojegor.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/wogejomikixobapa.pdfIn PDF document text
    • https://olterus.com/contents//files/purabifob.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f057a41c52---40274914721.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/fagax.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/72848433504.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c28288d0db---vabazetukaxulavida.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210531135208_1606642996.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/gajovukinixad.pdfIn PDF document text
    • http://gyobel.itpublic/file/tegigopebikimupesejatad.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16266958800a6da12dc02239312f15.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/59859167372.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/dcd14a84a1d663f2730e7274107bfd4c/66313292087.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/11286217581.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/69441043656.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/h50eelr0b0s6hnt5u0vskbf1ri/95745416273.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/winejutudelojegapofozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=computer+ergonomics+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_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 10884 bytes
SHA-256: 3ec585ff3344b8c5e0b822c8d4123bfd879b72415903f4cba7ccb5f95e77ef1e
font_02_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 17416 bytes
SHA-256: fddd11454a495145e2e5132b2fbc5fd1c5d9f0e6da0f6af84f0937120ec79780

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