Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4782534ad9c41d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 04:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75a73d88034d017d8e396f7d8c16dabb SHA-1: 6dcdde4521680f5594a4d8305f7c06893afb702c SHA-256: ed4782534ad9c41d06437cd1210f27a7ec6f0f2d494c64015ed8d390eddd04b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to host and distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=bollywood+movie+2018+download PDF link annotation
    • https://beyondpins.com/calisma2/files/uploads/pazatekuli.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/82a61c42a35e2d2725a10ef4d60336f9/gawidolunujozesodi.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210910_0A0805432304D8C2.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/87207821051.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/beb13f71d99ca51b202afcb3aa200923/1683672960.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9d310cdd---22044931013.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/banesuvugageziwejonetor.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/rujugutobajaxisiwomasotar.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161326b50d1c1f---82420694739.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/82222716219.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109060806149007.pdfIn PDF document text
    • http://minerva-collection.net/files/files/94479108393.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/vudowezojolokulu.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/9289711296.pdfIn PDF document text
    • http://hkalc.com/userfiles/nomeburikativuvaxesazemu.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/50093695774.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jumewenobakuperofuzobizev.pdfIn PDF document text
    • https://airxps.com/userfiles/files/vapatotisawojubidebeg.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/jenitavenokotozop.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/81740243183.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/gawajedavuwovekej.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/zifirexak.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c668feef78---gibaleg.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_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 17376 bytes
SHA-256: e39512dbb38a50f623bc7d1a56920b17edf274c8ec90667e40a573be83a5a097
font_01_sfnt_off000110e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F9 10864 bytes
SHA-256: e5c2e3fd490643e5731701133b7cc98f8ac50840c5083b3546216f84355ef1eb

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