Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f57293d0245a1a…

MALICIOUS

PDF

73.6 KB Created: 2021-10-02 12:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d9f82a5722e0accf17c87910ce738296 SHA-1: eb6e6f0c2d34993eb5774321a315e7152776f88d SHA-256: b7f57293d0245a1ab30915d00c19ea1a7eaa05776431e661376aac3a1d15dc93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=revised+meaning+in+malayalam PDF link annotation
    • http://advocaatindex.nl/images/uploads/wopenitimu.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/pixagixugotim.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/31695073831.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea0ff1d42---dejibeterikopo.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/9484559410.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/tomarutovus.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/munijibufujivug.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/30056153923.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613338ea5f8ac---vurunabimub.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/metenizuxosabijeluzum.pdfIn PDF document text
    • https://titishop.co/upload/files/70143519498.pdfIn PDF document text
    • http://klenderbio.com/upload/files/47443006207.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/91674728293.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/tenar.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/27152949077.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/kifewusutejojozozenop.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7ba6d6a9be322ba302367ca51bff48f5/64404102552.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/6321823393.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/lamuwiso.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/nifazidix.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/tefudiwu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16153687e53e31---27494436213.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_off0000b4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CA 10500 bytes
SHA-256: 0bc38caef51c77b528bb2d5d7a7a2adeeffdae9f7d95e2f939deb5dc78a28f05
font_01_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 20060 bytes
SHA-256: 02679df9f3adf321a444e7a1336c456810dc2aa02a7d42774c0ce32eef02c74a