Malicious PDF — malware analysis report

Static analysis result for SHA-256 f071c2a71e9a9efb…

MALICIOUS

PDF

72.7 KB Created: 2021-09-14 04:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f4fa6b671e4aa37008a13611e345998 SHA-1: 81c81d49688d049777264102d91165e5c67e8d30 SHA-256: f071c2a71e9a9efb42d956e465c71de61495f67bac9583669a8327fbdb7d20a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The presence of a Google feedproxy URL with a 'minecraft free download' term indicates a lure to trick users into clicking the links. ClamAV and ML classifiers confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532f8468b7---10000381885.pdf In PDF document text
    • http://jcon-aps.dk/userfiles/file/zekexu.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/zotobakagadowoxikasobira.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/jajamu.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/40011597414.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/satum.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/potojuvepa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6dde4eba---4581772321.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/jimiwifipes.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/felaletozisukiropijin.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5f0be030b011827a14c1cba9319ff0d8/6728494609.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e07c2d03e48be2c2ea3a53ab4379a9ea/68145318816.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/xuvudutejedoresuzi.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/vabulewolijinoper.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/48059038919.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/54502356563.pdfIn PDF document text
    • http://lulanjina.net/upload/files/70122447256.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5b6dba4b---resalonogo.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/47220082650.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/1596354834.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161334e48b7a26---xitofesuwamesugazefiwof.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/28762383821.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/7421281540.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/tobewepefivusipadaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+free+download+1.16+androidPDF 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_off0000bb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 16464 bytes
SHA-256: 0db27a7e8261bb8ed2c2276bebd7b7beb2a4c03a78c099e6818955638ce2ea9b
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10668 bytes
SHA-256: 384e887a4204eedef2fd5a43c839d98ee5d5f9f639d96614fe6e55252ba8825a
font_02_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1