Malicious PDF — malware analysis report

Static analysis result for SHA-256 c641bc8952055860…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 18:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7453599863860d3db27870184879481f SHA-1: cb09a5b218ed72de4412fa131f28cbcab0a5ac27 SHA-256: c641bc895205586093f2bc38850652584b50a18b8048107f12435d7a2578b6b3
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://psycare-spb.com/userfiles/file/lupolenobine.pdf In PDF document text
    • http://ttccid.com/userfiles/files/65340543699.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/349938map5t13qh7okj0otkl02/47335571408.pdfIn PDF document text
    • http://machin.kr/userData/board/file/zanamawimomifodasuwe.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/zuwodume.pdfIn PDF document text
    • https://stotex.rs/files/42584051502.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/41659000835.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/banuruzuwemajawi.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/5197668616.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/kejevijazixipi.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/39114956198.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/vupejoxiletagum.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/59993825634.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/345991061613bb304e006c.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/51513144490.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b67faa61f---labuvuzusuz.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/gisagipowibazodarilibixe.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/nagikesirivan.pdfIn PDF document text
    • https://alohasafaris.com/files/temejipuf.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/xufaje.pdfIn PDF document text
    • http://grafitym.kz/files/file/mokegu.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138000b8085d---90287688243.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/86069934016.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/79843986550.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/86463654400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hacking+on+android+phonePDF 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_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 10564 bytes
SHA-256: 42f4ba51f50632c27d2c1c6e9978cdf52dfd731c9cd64f27dc07d26a6d410c6b
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784

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