Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffa89ff49c48853…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 13:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0b9c12a10093be0c4ac6adccf35d87e SHA-1: 00101da0f011d15ca843747d67405e2adb2a6f03 SHA-256: 2ffa89ff49c4885398bad5519c7a01b968f709ca2837deb1b7e17ae1eb4251c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://biocenfis.es/uploads/assets/file/logigelomaxawewake.pdf In PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/mijuxawetudoler.pdfIn PDF document text
    • http://guowangcable.com/d/files/wetobuzudedakujisuzafapop.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/n6o2rdft0g7l9djcf9a5d18cae/69415214911.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/10330122191.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/labosakanujik.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/42678760497.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/kuredisokavugulabujesem.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/foloraxum.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161465e6d6fcaf---43713020614.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/vanezesejeko.pdfIn PDF document text
    • https://ekransamara.ru/files/kofede.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbcf7b85a---toritotok.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/gelatuvipiburikenije.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/munagituv.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/lipagekepenowa.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f56ab6767---wozenuligexolanirudimugow.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/lemumudoredutejewakijab.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/ralijejosevike.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/jujipu.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/vajulag.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/76881206039.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/80928773329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+i+link+my+phone+to+my+smart+tvPDF 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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 17016 bytes
SHA-256: dfd8434b51e2d5eb36d5cc906b5119bcaae26956ba959f3df01d2f3c56ee9160
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10820 bytes
SHA-256: 1254d910e1a5ad013eb7498b2c6530dc123f787fc9289a74f73d00d040a3cc4f