Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d897442957cbc1b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 04:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a60b5bf8f1e50ca664426b7d183f886d SHA-1: 2ca470f963ff60abc5e781dd278730740596eb91 SHA-256: 7d897442957cbc1b3112dec8eb3050ed3b084a4f92429266cb8496ae96089238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, including one pointing to a compromised WordPress upload storage, and another with a 'utm_term' parameter suggesting a phishing lure for a Windows update. The presence of these links and the high detection scores strongly suggest a phishing attack aimed at tricking users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=update+windows+10+2004+offline PDF link annotation
    • http://hkbroadwin.com/userfiles/lozavuponave.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/kisoxo.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/mamegokatoteze.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/wupabo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134e023a8219---84459637533.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/mifiweweporufifesa.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/bigonebi.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/tazugogodojepebadojolepu.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/7517854141.pdfIn PDF document text
    • https://kimansion.com/uploads/file/26150660064.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/xepemafusegazofiwomedu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5ba22d0c12a48833f1d0e41b61b5ca37/28638291613.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210909142358419812.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/dmfigt8p5bgoekkq9lcq08vsnm/pufovuxodetazibemo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210913172747.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/guwujugomuvofo.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/lugesezerepaxubusimesika.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109131502574409.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/74235169373.pdfIn PDF document text
    • http://zenithmetals.com/files/31156656276.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pikufexilagone.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/magowuvafizijani.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/dezotaf.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7e27a3d38016f9abd8d56d8c30bfca28/nadibis.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/kilasezexipupunopanawuvo.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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 18840 bytes
SHA-256: f83bfa4e7ac05d3805f9b806027d70ef4de97b553bada42f66822aa8ebaf3ee9
font_02_sfnt_off000136ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 10856 bytes
SHA-256: dc452344a2735ee7edfe75dd0b8afd7c1eaba2969f211da25db3ab91d6eeeb89

Open this report in the interactive analyzer, or submit your own file for analysis.