Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c51fe97765cadf…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 10:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e27b8499107b7bc6ede8e5e8e22986c3 SHA-1: 54e9efd46e2f52801d259e0c95bc6122af15154c SHA-256: 23c51fe97765cadf66af9b1034bfc12647c3f2f60239fb40e11e1bc1c57cadf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adb+driver+not+found PDF link annotation
    • http://pogologistics.com/ckfinder/userfiles/files/74681341804.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/xitamopaseg.pdfIn PDF document text
    • http://tajilin.com/upload/files/radubozorinokewapumelibo.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/pexemelozedopefa.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/39393382872.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/pimoxow.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/pumoxosopijezoloxigige.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/14663831582.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zulirofog.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/39118774605.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/62608868828.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/rakatidelegul.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161328bb2c12b0---xunupenalonetovam.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/76520241615.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/jeroluxowifitujulepozezi.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qg4466rrghhh3u3nfamihupjr/tufop.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090117041067.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/jerigifas.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/juwakipobu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210901071430_1336696146.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/78212320077.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371e1d11005---resanofipaxakodijom.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_off0000cc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC48 10260 bytes
SHA-256: b93c609fcb1b26e0f6ba999fe100bd6e7cf183099bd354ab52cc92d97ef01a55
font_01_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 17120 bytes
SHA-256: 26feb88df9703fb042f417251cc754533eb4120a25766ee7436d402d6666bb90
font_02_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.