Malicious PDF — malware analysis report

Static analysis result for SHA-256 884f749659111672…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 12:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6ffeef6c22e8dfbf5ac51b261a30e47 SHA-1: 8c12a76eb69f167a7c4b0e9c4883e15dcb3a1d82 SHA-256: 884f74965911167203549202bffbc171486d1fe0402a50ebe15d117f1a336672
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. The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or conduct phishing. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6768f4186a993f73ad362ed5bc95651d/98679694775.pdf In PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/sidura.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/kovunabixusijozapawodisin.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/goxexinupofeleb.pdfIn PDF document text
    • http://goref.ru/files/file/walivixuk.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021922165514.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a9292e6d4---divuvusuderi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c058731a46---wefarobiwuvuzodatix.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/68699328167.pdfIn PDF document text
    • http://budka39.ru/files/10338097443.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0c07d7f052bcbfe1f4201bd7cb48bdb4/89340051232.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614573a5e3fab---zejawumafowitimim.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/tomugipumunabuv.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/regejijezo.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/batemawufasudobidif.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gadumutivuz.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/13961743684.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/94766694206.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/51831339620.pdfIn PDF document text
    • http://abnicum.ru/files/file/lalesefixe.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/gerafagapadunowen.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/nosumadunufumazuwosajaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=download+amazon+prime+modPDF link annotation
    • 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_off0000b0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FA 14920 bytes
SHA-256: 021fdb46012e55fb2e0a0f4ab5528bc83dfd28d3532e659c1ea3286d25f8472d
font_01_sfnt_off0000d642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 10432 bytes
SHA-256: 2fb755af4fcaa3271e81fb121b8e11e53880de49bbd73cda833d260f740abe19
font_02_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1