Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bf8f325a9e69c6…

MALICIOUS

PDF

88.9 KB Created: 2021-08-12 18:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b6d8fecfedfea1a9f2efdccd36ff63e SHA-1: 11930697a44b79fe29fd95f070603ba02cba9db4 SHA-256: 45bf8f325a9e69c6a579f018fa9e1a7adb0486c792dfffc48cc0045c7944b407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=past+continuous+interrupted+ppp+lesson+plan+pre+intermediate PDF link annotation
    • http://thy-environment.com/userfiles/files/21732755270.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160966ee83a15d---tuvipotujavejikozaso.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/24607029163.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/kofawinabetokada.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/39083525445.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/12775989576.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/pejetem.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/wazesel.pdfIn PDF document text
    • http://vejwun.cz/images/59441517999.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/ragubokejakakafo.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/lagiwu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0f6e2d97b3d04581c83f962af9a6b20a/digowilinekumifiwa.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lazijenogozava.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f131ad84b---wonufizo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a916d6ba---75056712568.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/fulumalasuwemikujemedul.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/nosuzosibipexisogaxajatuk.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/82956633770.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b80709efe016a886f7088b9ad05e873f/nurofemuliwugexuwozisun.pdfIn PDF document text
    • https://olterus.org/contents//files/wazeke.pdfIn PDF document text
    • https://tomas-music.com/contents//files/5404211394.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/k23ocfcn1rilojshae5b2cv3d5/11458379633.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/42235689289.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_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 18756 bytes
SHA-256: e60b838f6379513ee828788eca586336dccf51474106173bff8c8939175f1536
font_01_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0C 10776 bytes
SHA-256: 903ffad888a4e741597d2c51b8256682e1fb525b0fd774541ad94747cc8b3746

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