Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc98debfeb292a55…

MALICIOUS

PDF

73.7 KB Created: 2021-07-08 04:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 825faf08f9f40013db9d783ba0596202 SHA-1: c357a779c79e6898a033c11e78a1a4c213780fb7 SHA-256: dc98debfeb292a55ebcf22f07edab9bdf9d0f4ed46d8ccc2aebb51b756890d16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=learn+french+with+alexa+pdf PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b9a00b75---nobegazesoworavevesu.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ee8f791675b7fa4b9648830cec66273d/lipagofafat.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/31606279537.pdfIn PDF document text
    • https://clinicscrm.com/img/files/97506249005.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3eb681336---74385175537.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c5719cf1---fonabed.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051216241133.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/30c14910d973adf4df8396dbd9219a90/13860282200.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0caa9d06---2072919628.pdfIn PDF document text
    • https://coil.hk/upload/files/66909687932.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f817f2b6---69825642272.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/73826695390.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/88025556986.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/poop7k2s4sucbsdh70e5fjlin2/54723995632.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9e9f9bf279baf138969c2e9e1044a400/nudigotegulu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9a06fc57---63136538595.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/jiloturizutak.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061119064278.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/77422d7651890aa63e9362819f093ae1/42928640401.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a51783509a---xorevikukijalifigida.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/15294842137.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/tuvuso.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021070219358_918501460.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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 10572 bytes
SHA-256: 197d8ee4e70e75ac1e98707016c78f4ebcd8b2d6c4289ed3b0e7767dcc19cbd8
font_02_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 16288 bytes
SHA-256: 983e0d6eaba3c80de5d44bb401ab74de651c79deffb23e0b89eb33a109ee05fb

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