Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb46199bbe30eb78…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 20:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a11377b58667fa3765ab5aa0523c8c4a SHA-1: aa0411613f3e2e38e45e30689114951bfa5895a1 SHA-256: fb46199bbe30eb7847f31d092b5b909a09923de68c13e2a981b3a72165a09abd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect the user to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=virtual+android+phone+online PDF link annotation
    • http://tmacfashion.com/ckfinder/userfiles/files/bojaxolok.pdfIn PDF document text
    • http://dejede.com/userfiles/file/52639672115.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133d54e451a8---64055418993.pdfIn PDF document text
    • http://konberdbio.com/upload/files/tasofufarojigemizune.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/7473578386.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/29c04bffbe7a7f38ecd6c5455145d63b/38341838237.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/xoratutejapazanidegari.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/12465032974.pdfIn PDF document text
    • http://jcpingie.be/public/files/gexukutugigo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zamire.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/70623906498.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/87366681946.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/newinipekupelulena.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/22913874891.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/36661111429.pdfIn PDF document text
    • http://dsagco.com/Upload/file/6722767016.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb219d70f---fuvus.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/2050022944.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/arfdm76tmk8066fjafkmc1dd61/39817828811.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/lafexagamedupala.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/nagoxezovi.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nugapexepis.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/nogarujunenajimuzifon.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_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 10388 bytes
SHA-256: e4c8a0eb5efe66878f0f525a01d3e2441ac0d9d7044a3b9a561f0a08a7d88fff
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 17860 bytes
SHA-256: ad1fe7011653378c1fcbacaa71802d56a4bfb240526837b50ef75165cc458719