Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d51d995653b1fc…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 17:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69d728a37ec15c4ce95e569dc8c0fff2 SHA-1: e73806e1f5dd401e5cb140ea39a5dae79656185d SHA-256: c4d51d995653b1fccb07dca128047f17d90c83cd729153259303a952bb584a00
124 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.1739

Heuristics 5

  • 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
  • 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://thokhoavietnam.com/upload/files/17631055551.pdf In PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/23091029958.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/lerowu.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/nogakipe.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_B79E3A9B8DD2D139.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/ralegosabawudikajagefoka.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210906/file/16309529442516.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/vufabawafirofo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b730dec5---510076378.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/29907932987.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/makonesejajomebave.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/zonopewarugepisek.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210907_B0A5157F385D462B.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/tugojidufamuzid.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/lijekukopezonufe.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/43074211578.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135061a7cc17---60519102898.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0fa1adfe6---sawodomafut.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/63301582363.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/81058513117.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/valawikupunukifi.pdfIn PDF document text
    • http://renknh.com/ckupload/files/kalawewexaru.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109032036389353.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/53420989494.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/92831035253.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/7173812201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+100+likes+on+instagram+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 10900 bytes
SHA-256: 6ddf5746e004fcc087a534178f8542e34fb854fb3af02515740f076def30405c
font_01_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1