Malicious PDF — malware analysis report

Static analysis result for SHA-256 4508f3b70756ca47…

MALICIOUS

PDF

84.5 KB Created: 2021-09-03 07:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21a1dd7b3c5e90181ebd4bd371b74fbd SHA-1: d6d196b2e2147d4baa375de61dcad0baaa04b329 SHA-256: 4508f3b70756ca47640613bf697fe1ce3b88bc78fb9d088f80ddb6bd4ae58bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://philabc.ru/uplcv?utm_term=diversidad+cultural+en+mexico+pdf PDF link annotation
    • https://cowichanmusicfestival.com/userfiles/file/rajuwagozifemadarofari.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743ac8b3a86---muzisefibubuvirezedo.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/53680738220.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/dokobora.pdfIn PDF document text
    • https://fishuntpesca.it/file/vebenejepodir.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/tunemusumokufizotejuj.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/mogusiv.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/77223777871.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/d3hcp41h99aqijii1podtaqafu/97994403354.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802c3a79d44---gojelalakadar.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/lizofoxexivexalekeged.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/dakogozetu.pdfIn PDF document text
    • https://aksusu.com/upload/files/puwadafa.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/k9o096jq8ah01i8ohttmb40jpi/bajexudupag.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/1855282750.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c707f0caa---jelal.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/th9hlnopmoa6cj7t04lhhsp3lv/44737735747.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e114c9512---kifuvarotenatikuzorixepo.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/2123809404.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/larabisawojo.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/53691902825.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gb7rpovliindltmg6otu9lbl86/zizozajo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/44370153459.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/61863657724.pdfIn PDF document text
    • http://luatsuavina.com/userfiles/file/41024599793.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c83fb94152d18a8b166bd532035ed9b6/62706651975.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/97686791735.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_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 19228 bytes
SHA-256: 9bb6cf61e57794154f0fddc10bf719a0f21f87702a97726aa05d15bc50eae3a9
font_01_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 11052 bytes
SHA-256: c636df7cb52bc41475f9ea3d49b1bcaeb8e6c70ba6a29f1911151601739ffe53
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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