Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5ea351b22ed1ae…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 07:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe12ec8c7fe7e487060d01e12beb25fc SHA-1: 3e3ec9219896ea680af3b0a8d755c2e703c5a328 SHA-256: 7c5ea351b22ed1ae707f32ebf736ee0923095cd7bfc6d1c99b415d7458d20bb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 https://coretry.ru/uplcv?utm_term=neuropatia+motora+pdf PDF link annotation
    • https://superpart.com/files/xowezelomedutigojajegez.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/zuvuzusajuwijagofedososu.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/76659417483.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/75425057103.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/zuzebu.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/topijuruvujugujo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7c42d2de181fdfa4383a3c3503e8ffd/xefujubegosogusefobebe.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/78499497656.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d350a49c---27506027009.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/sewasubapagifasodow.pdfIn PDF document text
    • http://distributoram.com/files/file/xupawoj.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607841d4f171a---37352984004.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/88031259255.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/vovuvijazefomifa.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/mizamekopovu.pdfIn PDF document text
    • https://yuktogel.com/contents//files/7802671617.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/87723559052.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/wifufisabiforoxez.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/58728129674.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/79357457290.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1o9l8gdhabd0ibkvdl7q8abrq0/xisiluvo.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec3e90339---pivirukesonedupa.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/n1bmk0v6rg8le07c5qdemge07q/62006689232.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877ff098efa---mamowibadusanor.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608527c453c6b---63680124221.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab64464517---95319964057.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/zirojani.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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 10420 bytes
SHA-256: df2ca405081b34ced5c4252eeb686f2d8b9e31c634d366b5193f3e8f7c5446c2
font_01_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 16532 bytes
SHA-256: e9918940ad62b60ab8ca800f670eaa9894dc3c9b18857b0adeb7c201afabe159

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