Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c8ecdef1ac7d247…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 03:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 56025c06e4c628a0fe5d3cda8fdf51f0 SHA-1: da2f0a76c19f575652b12f428c73fdea2824d34f SHA-256: 3c8ecdef1ac7d24764ca5414136727723f390dccfd7bf1d03f878f053ee2e0e2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics indicate the PDF is a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's used to distribute or redirect to malicious content. The embedded URLs likely serve as lures or download locations for further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://oniceh.ru/uplcv?utm_term=star+gold+4k+live+streaming PDF link annotation
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/toi5hsdnm07ss5qedt4n995edk/dogelisinew.pdfIn PDF document text
    • http://maaramachandifpo.com/admin/userfiles/file/rubeji.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/gobotemusurifo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161521844c3d96---80295580221.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/jifadopapijoparunupox.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146380460b3e---pobanagozunagejosinu.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/75488202708.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/xumaxiregigebajupetuxezi.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/mabofodoruxezuxos.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ev7giq7824j1flfqmk8g2qiej1/93308267000.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/55293636535.pdfIn PDF document text
    • https://melz-feu.ru/upload/dikisenibejisojixovukuj.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa9b7e9225---47771377654.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/giwazumofufujo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161423f4b843f8---neromani.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109151334534884.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/wurutuxemezeros.pdfIn PDF document text
    • https://exam12.menapoint.com/app/webroot/upload/files/kapifimixiribuzike.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/87182328386.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8009671cc54e28ed877fe639fe501c53/7737103639.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/o6e4opqru29n18d60crvk3aev3/70323056664.pdfIn PDF document text
    • http://newworldss.com/uploads/file/dufapurugodi.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/xabesu.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/76894792197.pdfIn PDF document text
    • 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_off0000b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB020 14708 bytes
SHA-256: d741421097cf54aad003939efa773a421224c99ac655df3eb0df755af792f3ea
font_01_sfnt_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 10904 bytes
SHA-256: d2317c95848eb31cd8ae7fad93633652aa2be8ebf1a5175b775d43768932b466
font_02_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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