Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a77f8c83471bfa…

MALICIOUS

PDF

76.8 KB Created: 2021-06-27 09:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e0a9981bbe26765a002658424ed9857a SHA-1: 106db5fe26273f0dbb27115742de82e4edbd50d4 SHA-256: b0a77f8c83471bfac08eb2c2c688a71b2f82d15eff3a7ed3a78a67b15a09ca5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=online+chat+like+omegle PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021061610502257.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/f553278bcec9bdf849683d2596c2f85b/polofotupirafej.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/63248417104.pdfIn PDF document text
    • https://aashianarealty.com/file/57271357354.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a39a7a01---puwaxasifewilanugigaw.pdfIn PDF document text
    • http://z500.si/files/gatize.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/82659912179.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d9ff2f56---mogedel.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/99852661018.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/79698a4dbf23b7312903d5627f349eb4/divufikegibelad.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c51135c02b7---fezekebobiwofosogijabaz.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16081faa6be0eb---damadugisimedi.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/708a4b8e4a78ba9215e5ef801cd138c1/24713347081.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086592968735---48920464263.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160742c856d20d---rozipekine.pdfIn PDF document text
    • http://halaljones.com/uploads/files/birujozaxetum.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bakamujodeteromavekebura.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/fekala.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e0f15546fd21ae65250e125a081044d9/5414441772.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899942a3176---70789570126.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eaumgiob0c513d9btbcolg7732/luduxidukixopubevazorijum.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/ripuzi.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_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 10524 bytes
SHA-256: f361f2437e08340ccf8a3a8356128e637357093219dd348a451ce6cc3e5e43ae
font_02_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 16116 bytes
SHA-256: bd8e9245bf4ae4c91d238ae1ee18d1845182c0d587bb24570bedfd498c930963

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