Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5ddd888071c228…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 05:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e014dba35f4a7f716f69a6b56381f371 SHA-1: db15bb45a59c3cd48a0d3ce841201b4013d6f67e SHA-256: 4c5ddd888071c2283ddf7c7a32dc16a3dbfd1f7daa979ff1c5187988ef879890
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=depoliticising+development+the+uses+and+abuses+of+participation+pdf PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/3644db887156ed3f426a2ed5201ff63c/56083865085.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608420bbc9d84---furenebo.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/10566712602.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/jotusojisusibivux.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/vubimogew.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/58912277258.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-12/20210512025257738064.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/41208807716.pdfIn PDF document text
    • http://web68s.com/upload/files/tilaxivilajamolikomaluxix.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/bifut.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jijuzixogekame.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/70e20e90b62f2f0274fe4dffe3163368/dajolik.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125c59577910---35572758739.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210905152219.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/83418701469.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079146f6c1e7---85618662118.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/68f5ae22e249ec882e033948f1ba296e/dogidodidafuvimi.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/furawemipilolafanol.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/sevafokiximoduwu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096c1cfd1492---dikofuxikemevuvogabuwa.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/17407770152.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/piriluvof.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/al2pp8jqhu2tii29uvhfa6c4sh/67722782708.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/44585971006.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_off0000bdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDA 11376 bytes
SHA-256: fda4428eab27c37d678cb4230f661389ff97aae0aaa8c2ffc57e109a05d69b49
font_01_sfnt_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16204 bytes
SHA-256: c75aba4fe8bd450dd383a1ca6955c7dbbfa80dc92340e8ba2e8a1657482d2e3d