Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f2ebbf94fe5a9f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 19:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e4e2508f7492ef26986d6752cc6cc23f SHA-1: 3b573292efa2dcf6ad63a773d75909525b6f21f4 SHA-256: 84f2ebbf94fe5a9f18931d378e8d807f6dca630430aa7bdddccf8ad43c2bb70f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised 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 distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aybar-gallery.com/userfiles/files/84211262512.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6b9fac18aea49199e1b35760804fcd9e/foxufariweferuxikubita.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0a2a1201---zupowolajeguxelas.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/77108105634.pdfIn PDF document text
    • http://orlickachata.cz/files/files/99837344723.pdfIn PDF document text
    • https://servicepapik.ro/files/zoruwobasodovupovukoluni.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/nitova.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/jelitadug.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d604dc123f51984dee93445b5c191a3b/70614933553.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/38554464534.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146708c91436---92305849141.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/tabumotumuvixadiwugen.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/xuxenugajo.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/23108829491.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/56765229010.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/50155671155.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/kotilanolefamejev.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/nijogizujudejigo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/lerudojek.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/pokej.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/jezamusarumebutofud.pdfIn PDF document text
    • http://aimic.com/userfiles/file/55344954022.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/pavinuvojeda.pdfIn PDF document text
    • https://swiz.eu/files/editor/linevim.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/69673480187.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/kuxezevuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=nova+launcher+swipe+to+open+folderPDF 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_off0000b46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46E 15300 bytes
SHA-256: 82da8dfd71bd3b1e472e9774f1c4a1a02a19be315db6b0721ce8068740a5e567
font_01_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 10948 bytes
SHA-256: 201c1775b48ea0094d3449e55685cd60b98d864be4b4a8e379160176ff91af65
font_02_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1