Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3cf0e32533bc61…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 11:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1ed433f30ef36ebd6eae77dfc4eb1a4 SHA-1: 41e1ba98adb17d35cc09674225c4427010ab2932 SHA-256: 2f3cf0e32533bc61be070a3829be815e0159ad7966fea065dcf0f4acd994d7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of 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 structure and numerous external links suggest the document is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=verbs+that+are+stative+and+dynamic PDF link annotation
    • http://aeronautike.com/userfiles/file/68372626751.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210603_33013163344068AD.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c14142bbd13---27477293838.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adbc476ec5---xevejim.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/gagexujirebawamidales.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089d8e3cb54d---78333496524.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/8871735676.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608719dbaaa7f---79325547699.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/691f89bab61ecb5061cf9460facbdaf9/58215743082.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/81028141803.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/95101334932.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/bilolujaram.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079d7627c424---14072532255.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/88727022102.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca1dbadb5---42640394013.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/nigakividixasuv.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t8352rh39gk1up0apvnko1o273/38287115053.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160807b1e0e26a---daxujigifofadowirituguwa.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/bogizibubumumamafax.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/39352235909.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1f08d1ea0---sejixipexijomunuvakivib.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/8a14769f9db522656134779954daea40/56668447732.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qg1iatsbsdrnjkbltgjqcqbgoj/77553040508.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6d4f37cd---45380171659.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 16348 bytes
SHA-256: fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
font_01_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 10756 bytes
SHA-256: 42aec78c6c4a3e1aba5ea737c75bd532d3d3bddd0612d2e790e26c1335fd635e
font_03_sfnt_off000130d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D6 17240 bytes
SHA-256: 57973caf8371dcf39274f62e4122d944e165eaa86be668c809eaac180067da9c

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