Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3fa98bc64b88d3…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 05:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a8691a368825fe8d60c8aa3609f861e SHA-1: 6a77582195cd9ed40b6401372c5aeda7d69c47a5 SHA-256: 0d3fa98bc64b88d3279cf86c8c4c338886c5f50e5c18757ce49929b542e785f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malware or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607720ee85e67---fowaruba.pdf
    • http://netisiletisim.com/guvennet/resimlerfiles/fojevuxig.pdf
    • https://capitalsyndic.com/userfiles/file/1241447945.pdf
    • http://adria-ex.com/images/blog//file/duxisotutaximuji.pdf
    • http://gyobel.it/public/file/89381473752.pdf
    • http://helenhotel.vn/upload/files/89988022850.pdf
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/12280626535.pdf
    • https://atlastoursntravels.com/userfiles/file/xijopabimuli.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/51feeb545cd273f3a31e606cbb8fd477/wuxixe.pdf
    • https://deltagroup.bg/uploads/file/vozipedet.pdf
    • http://rebizplus.com/userfiles/file/mubukerekasibijirug.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/btdm0pepuovs2kss17bt36ve2n/45235234459.pdf
    • http://eviljoy.com/UserFiles/File/sosuzemuritifagakeret.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f01c896e63---fojodekopem.pdf
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/93576806576.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/98ae6b83a1e08062200b6e6c75785729/30525218806.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c75b06f311c---vemonef.pdf
    • http://kiiga.ru/userfiles/file/demun.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/42968269968.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/lgh495u2h1f14gqta4e831avvs/50135562491.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/8af066b4144a6d9a1b6aaf10379d9485/fodepegeselalu.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4fbff434c303f161e16b405fb56b1c51/57045753796.pdf
    • http://drivingschool-brno.eu/files/69242598280.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9463fbad---63434818278.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795db4ccf52---7087747325.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d240db3a80499f8b5846ac56512589ea/29587616402.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=portastudio+414+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a4.bin
c9b35991fbaca1b1eded088c6491a7d47f42d789a51e2b8b5f160b1af9176eb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 21616 bytes
font_01_sfnt_off0000ffdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 16792 bytes
font_02_sfnt_off000117f3.bin
0a0f18e81dfd612548ebd276589c70d5d33167dc1904878e3fea239a653f5675
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 10508 bytes