Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35b6e50d81dfad3…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 01:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2b642fad0928512c0776095dca216b82 SHA-1: d9e533f0c3b479b1cf057aa06787267902b5237d SHA-256: d35b6e50d81dfad3cbcb7daa1ac55db9251e314b221d471a874c5859ca4c1945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with spearphishing attachment and malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/27701963637.pdf In PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jumurefenaxanisinefuv.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ia61t4fvnp99s78d7a63ca2auh/norobulekigepi.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/99217049047.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/deaea00bbcf754e7b6b759377dffd4e9/rubuwifagetejawurikifabum.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/24606322055.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922f5d2c489---norodo.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/pesumibemoferab.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/vodimarufodeji.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/lekuramiwepakegetid.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0f5349467187ca27ce2d6e7dc10fc099/gilibimawirefodijuvese.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/tafasirafoxu.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/78764847434.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/58530193434.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098673f432af---norigovexujatexovigovir.pdfIn PDF document text
    • http://ipublicity.cz/data/file/kamaxitawiwer.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/52606904928.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/28733e53795202910b6dfab43a04fdc2/pesevanisubiguvoje.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8945cc30f0---fakuzapuvawotin.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/85509276197.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/6864081836.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4a43e26714f7a7b03cd672c508e27221/55552103041.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/vinudeputubexusesa.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/69851475847.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/69096070741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=from+seed+to+seedlingPDF 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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 17280 bytes
SHA-256: 60e5c334fb4b262f77b3b983a0a60edf9fadf184c86f630809d6c0a93e63ca80
font_01_sfnt_off000118b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C8 10408 bytes
SHA-256: 1b5b0626f3144291546854f2927538829b43c6c73eca7854f57ee3335647cef8

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