Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c264094f236094…

MALICIOUS

PDF

80.1 KB Created: 2021-08-28 12:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27ec68a82012494f2dd9992f7423012d SHA-1: cde1f3b3a8229b26c476ffcd8267cdb7a693c873 SHA-256: 81c264094f23609472c1ff7586e5b71ce516a26fb9f5db14ce3233bd72257375
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The primary attack pattern observed is the use of a malicious document as an attachment to lure users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://diversecityuk.com/userfiles/file/sefefuxetezovakexo.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/45552437379.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/zivezajo.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/rukoravijupalikawura.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd97d34cc---39346927734.pdfIn PDF document text
    • http://aa-nusd.jp/72773344364.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/ratodaluresarixa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703f38be47e---55884944065.pdfIn PDF document text
    • http://bdn10.cz/files/file/xiwexekevosotu.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/nvsk0nmlutka39ts890la90m70/lokiridi.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/zukoresunafepidudibokemit.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076abf61d779---topalojokujam.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fa6e5461---49731479981.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/49095673638.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/37015614763.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/64687707026.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/69368352603.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/sezukenisupebutapij.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/64959349029.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/4945542899.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29c78a3930---99858950353.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/98584217674.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608219369700a---51474811670.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161140d397bf2e---lipinubijasimelot.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1d967871d8eabed48bffd0c8b895d682/75291281554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hearty+thanks+meaningPDF 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_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 18052 bytes
SHA-256: 8bed7d5066cc0c90c5920bb9699c8f9dcc024e9beec82c70ab5bc20f26ef2c7f
font_02_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 10584 bytes
SHA-256: c512e563a03a44a755d32f76998bfcf2ecbb7231c3fcd96913d843cc7799ed43

Open this report in the interactive analyzer, or submit your own file for analysis.