Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b3ce7ef3c9a3aa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 22:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6ca98ad74ec21c25ec93da680a3da21 SHA-1: ad75158628dfc88fc3dc707125e34d695ea3d959 SHA-256: 56b3ce7ef3c9a3aaf9f317127a2382ec6b553c26e45100f78440ea15b1995250
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7899

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://goacetours.com/ckfinder/userfiles/files/499599737.pdf In PDF document text
    • http://chinahongji.com/d/files/49911265983.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/81469475144.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/defoxakijasedukipasum.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9165f98b---71756900439.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/zavex.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f554ddb1---61277791772.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/75044851591.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/98482216167.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/51955956983.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/72060399354.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/90691962505.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/89265241637.pdfIn PDF document text
    • https://anup.bo/images/files/68268869655.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16143f6b90c83a---76771537727.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/010549452314.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31628059877.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/pegofanoku.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132982199e94---nekutemaziwoluberesi.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/46301708373.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131baea4ea2d---24381415911.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/30087781278.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/19898886853.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/kufefogifejozopizesagit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=love+song+taylor+swift+chordsPDF link annotation
    • 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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 10980 bytes
SHA-256: 40c527cbd3b05aa716b0495c08de07a6e752de060952515f21cf4ebc899bf380
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 18448 bytes
SHA-256: e8a561c7222a80a9539fc9247f024cfaebea8b88ff58279f7ed8fc97112bf241

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