Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf8c8f4d0b92c5d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 21:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 017fe9c8dce44e14e048358f6a7d294b SHA-1: fc86fc6436cbd04a2a61270676294ff7509c8d08 SHA-256: fbf8c8f4d0b92c5d0849b03bf1924d470ce79a27f675794bfeef607a591d823c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'utm_term' parameter in one URL suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=phone+call+apk+download PDF link annotation
    • http://files.ibiza-ferien.de/file/zekekuzolanuziredib.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/50844864257.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161347c0bb8bbe---11244841345.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/68956619002.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/7473507950.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/wowufasokotapen.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ea336a2263b23df7e0d1c45155320728/38539200258.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/96996789754.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sifomeluwiduzokiv.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/jiver.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/diwodasuxesujana.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109081354328319.pdfIn PDF document text
    • https://olterus.net/contents/files/52660530258.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/79401676605.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/wobuvilasopefadezif.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/65786017467.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/34758477337.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/23393038046.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613174cbc44ff---32326130720.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/joxabazev.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kepukolajenasesarozuzaj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6de5693d2---24368733611.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad5133469---sisositewalaxozor.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/2323503012.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_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 10332 bytes
SHA-256: 8211cb93a2f1019123f8816ab783ea8d02feb54d01ddaf9105331ae76839b4b9
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 19004 bytes
SHA-256: 9b7617386aee80f220b382d6ed9ce2da4621f93759c44576d61f040a789a263c
font_02_sfnt_off00012997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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