Malicious PDF — malware analysis report

Static analysis result for SHA-256 482bdb55326a1658…

MALICIOUS

PDF

95.5 KB Created: 2021-08-10 05:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bfdba0e2a29a16c58a70305eb3da84db SHA-1: 3afedb6dd3368e89d55156d9970f2a2c691c232c SHA-256: 482bdb55326a16589d892c6f61773cbe9ccf9ea5d58f0212c0c4b58932e1a4a6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://urbanconstructions.org/images/uploadedimages/file/vegigapimububukujijosek.pdf In PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/91306532165.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/33257066815.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999393c331a---4128115856.pdfIn PDF document text
    • http://asfalon.com/__files/file/69262154398.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fe6b1a3b896---rabijelujukogukipojanuku.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/84293046519.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fobosirunibofukuxozexuri.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/37221077967.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0ca5663a---gabuk.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/71418669099.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/favowajajokapudowemarepo.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/rozekavuf.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/tutejexubepasipizo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b3778c22bd0---sopezikaguzavevevuvad.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/lipiziwejugalu.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e0c38096bfe418d9e2a08ed5c8964906/99994930471.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/uapc9prk6vu8mc85ajlhfnvlku/tujurusuzalabazeluxeboju.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/6422510104.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210717044122787.pdfIn PDF document text
    • http://njxinbell.com/upload/files/zozuwosotaloxelabinixel.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078afef3f597---75037973136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=is+the+mediterranean+diet+low+carbPDF 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_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 10812 bytes
SHA-256: 146efb98c8cdbc737dfeae9c53eacb5b47b596192d13c173fb6e6d8f921a1ac2
font_01_sfnt_off000125a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 19000 bytes
SHA-256: c3824b1ad9a7f4ff93783d0ae1df54de91180d250ac1e36b1cf557387d023254
font_02_sfnt_off0001560a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1560A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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