Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c0e5a1927b8cde…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 14:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50e0717be5079ba18766fe3f5960848b SHA-1: 7148a5f10f78567fcf3e1e5875f90b010d18d071 SHA-256: 48c0e5a1927b8cde43d334e20244cb007937c523df9ceb6cbff133562fec22c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download further malware. The extensive link farm points to a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=can+i+cast+my+phone+screen+to+my+laptop
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5d7eb636---37930796845.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/50881519899.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/64936083563.pdf
    • http://boonfagrandhome.com/user_img/files/86914521413.pdf
    • https://artbynela.com/uploads/file/sokizifekopoperam.pdf
    • https://vivekanandbawwa.com/userfiles/file/zipapibugenesepanidojuse.pdf
    • http://pillshop.ru/uimg/files/salekesorumuzigapepalix.pdf
    • http://ptk-tent.ru/userfiles/file/44108453196.pdf
    • https://oreopay57.com/ckfinder/userfiles/files/61352205766.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/72903782987.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/bfd3ed9c6d7d6d9d6f71f0b1b9e7ac00/27176390814.pdf
    • http://civicwomen.com/ckfiles/files/kakuraxop.pdf
    • http://infas.cz/images/wiswig/file/92935867609.pdf
    • http://donghotam.com/luutru/files/kefejizuzux.pdf
    • http://nofatrans-int.com/userfiles/file/75287398696.pdf
    • http://massimomoroni.it/userfiles/files/58406789866.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/dakigufaranoz.pdf
    • http://dotacjedlaoze.pl/userfiles/file/86966121527.pdf
    • http://ychnjl.net/userfiles/files/liwinalufubegexob.pdf
    • http://www.moyekolodin.com/files/95723895373.pdf
    • http://files.ibiza-ferien.de/file/31284619610.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d85a6592b---latipikodasasab.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/65658200249.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d57c.bin
5a885a45f5bcde8a2e0752e80781d3f379252236f01a1c1b997b0b1c71836526
pdf-font-stream PDF embedded font (sfnt) at offset 0xD57C 18040 bytes
font_01_sfnt_off00010459.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
font_02_sfnt_off00011c70.bin
76010e1b44e0db5dedc8962db5635facaab4b338ec67ce7adf947959cabe499a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 10784 bytes