Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa804d4fdf323e4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 16:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e633d29100d20d789a3183059675cfe2 SHA-1: 0494c93d37a8e4f5ca36deb38c20dbd21cc494f2 SHA-256: 4aa804d4fdf323e4c5fd606727dc3d2e5398341896252f6cba124a43695f7b46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://cructi.ru/uplcv?utm_term=mast+video+status+maker+app PDF link annotation
    • http://carrozzeriardue.it/userfiles/files/lijofa.pdfIn PDF document text
    • http://rapet.hu/files/kozonupap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150271988519---8657125041.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/noxeneliro.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/91116340345.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/21088196928.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/26870806819.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/43844831469.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/13933973864.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/gozabujoxemo.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xulexajew.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143326b1c07c---nalilerawopidivagitufego.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/34ae26acddd4a3514d41126d07b8bef9/63276682713.pdfIn PDF document text
    • http://melvin.cz/data/fenijaxegabujekulanefo.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/67061729453.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/61842895089.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/38319186776.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/roguravof.pdfIn PDF document text
    • http://divelife.kz/files/file/33566047533.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/55464448803.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/83484810971.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/fejubewoz.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/sagofativujuxovibitolet.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/60349230444.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/82487810363.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/wijejobutu.pdfIn PDF document text
    • https://mattress-leader.com/media/wofipabakuxo.pdfIn PDF document text
    • http://xn--80adib9cjd8a5e.xn--p1ai/i/upload/files/zibab.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_off0000b9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD205 10656 bytes
SHA-256: 260a8978e4f1177d96bcfd454b5418e0320c81d7c832fe0054f1c501b772f422
font_02_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 17268 bytes
SHA-256: f8615117a1a6044badf729be8a3b6dd2c109a20eaa4e4c5a5d69841fca2ec1b1

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