Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6013fd1d053727…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 09:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b596a3caf7d414d6d9434f411989ea74 SHA-1: 99cbfc0ce0df5c495d40a256b2301c0aab1f4f31 SHA-256: 4e6013fd1d053727119a1d82dd0d79e13fd1c619a2fea9bb2b99a56b1d2430ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on 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 through these links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://irlanc.ru/uplcv?utm_term=fractured+fairy+tales+with+psychological+disorders+examples PDF link annotation
    • http://arcadia-fitness.es/userfiles/file/tavabuguzozegizurowebod.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/67129199971.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/pawegorotidovopuxejip.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/63067869738.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/84883964350.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210706080945.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/14605932270.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/serebarudozikatijewi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/rapirabawozuburofoj.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/jebirovigumuku.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/fuponavuwopexarexem.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/46170471361.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612831589fb60---ruwevekidenifekatedatof.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47dd86494e---46493541170.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/wekuselo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160df8281c453a---53754348584.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/81993037515.pdfIn PDF document text
    • http://herve-coiffure.ci/files/jupepuzapijozokipukanegig.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719996d820f---paxubunesivimisilo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160774eb61ebe2---25332589651.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/natozidexevuwita.pdfIn PDF document text
    • https://manenshop.com/upload/files/2127452265.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210826050510_15l6uv.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/12400312613.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/46378971455.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/48288777170.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_off0000c618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC618 11344 bytes
SHA-256: 19e1aaf17b9c6b515e6ca8c4817f207196c8a70227a706b46cd3302600686328
font_01_sfnt_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 16516 bytes
SHA-256: 25787b15dd1cbeed502ea8eca62c0b9f4b9643341df0f00e53900c33bc7c1edf
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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