Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce4fff0ecc6ea03…

MALICIOUS

PDF

70.2 KB Created: 2021-09-09 15:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72059187a7da76e8fca4740395f776a5 SHA-1: 269521becd39229f949d423c3d1e9ffaa45767d6 SHA-256: 8ce4fff0ecc6ea03f5398bc1160727acc6fd21a1e0867c407a1efc71c10b89ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. Additionally, the document features a link farm with numerous URLs pointing to compromised websites and disposable hosting, likely serving as a lure for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=hubflix+hollywood+movie PDF link annotation
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac624ce68---bediso.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/3968347739.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/55343793655.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/72420625760.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/fugosajakamozediwor.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/levedidesi.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/93407613685.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/2778343319.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/vonojotuxukibem.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/minara.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c07b01a6---datanaxela.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/87168695495.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109032155056405.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/33684874869.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/4120362952.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/wopepizux.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/valizodid.pdfIn PDF document text
    • https://laser123.com/geektic/files/33884239551.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109050221232004.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161368036be37b---98790767842.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f3d56a77---81363948332.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/75836588765.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_off0000b52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 10584 bytes
SHA-256: 50daa824aca16b87689be0da3771f2fee0d66cf9f4cdee6c5d55f6d02fcbfc68
font_01_sfnt_off0000cd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4F 14980 bytes
SHA-256: 13202d7f6aab49c8aa4392d5452d25bbc379a1a803d15d0cb541d5523149e7cb
font_02_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1