Malicious PDF — malware analysis report

Static analysis result for SHA-256 575d2564c5836f94…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 18:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c74e144d3fd50b96fb40ae3d5a55a996 SHA-1: 316040e746bbae236803879f379b26791ac5ee47 SHA-256: 575d2564c5836f94897945a8070b07f7c7fb028f3e8bbc7422d3d6d69594c0ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious payloads. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://grnca.org/img/files/files/17141233950.pdf In PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xotumibapepakabatosabum.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/60491756741.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607895ac1aa0c---87624938278.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/vabuwa.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/mopudifibuxegow.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/11199557009.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210701_10C277B2FEA9EE21.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849923bba71---66597580235.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/57825536707.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/051dafec2df69391fe19e92d112e5172/70376706355.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/77088652254.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/58262423610.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/96879141551.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/d4c42eff3e947faf4e87ac100e619fc1/25640434037.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/kogiwajetijiwiniramujij.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/widutovodebefusopejaladet.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tcet4f307th87ggtd5e185sud7/fegenipimasipur.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/57487190344.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/77252828159.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/tesifukagumodub.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/jabubizasazomig.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/18123663808.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/93137319133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cara+menggabungkan+dokumen+word+ke+pdfPDF link annotation
    • 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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 10884 bytes
SHA-256: 4834c8dbc7665676234ab3ae60cb9cf149e1c096bcbb64cb73e868ef90c7cc3f
font_01_sfnt_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 16716 bytes
SHA-256: abb5c85598d1cd0600ec82dde2a3e17a00bc34c4072e7bb7d5d94d643b6d5d56