Malicious PDF — malware analysis report

Static analysis result for SHA-256 c677a262d3d06797…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 09:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e383def8ab883aa5d11e8d20c7ceb39 SHA-1: e1a3e5e4c0dc3347fe5cb555e060a29786f0a0a7 SHA-256: c677a262d3d067976eaa2b0581a9a985cb82758a9d6ab5d7ba290169e13c4ca3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous external URIs, many hosted on compromised or disposable domains. ClamAV detected this file as 'Pdf.Phishing.Trojan', indicating a malicious intent to deceive users. The presence of multiple links to potentially malicious content suggests an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a56b88905---nunowelakoj.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340071c54bc---fapodevabujebu.pdf
    • http://samocvet.org/foto/ck/files/48660309058.pdf
    • http://fuerst-architects.com/uploads/file/90638533619.pdf
    • https://ls-machinery.com/uploadpic/files/202109090507223928.pdf
    • https://art4you.sk/editor_uploads/system/files/57551753300.pdf
    • http://baldonimarcostudio.eu/userfiles/files/87000447278.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901075954901585.pdf
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/vefevoz.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/76868166467.pdf
    • http://adaviestransportltd.com/userfiles/file/9685918685.pdf
    • https://panificioilcavaliere.it/userfiles/files/88103493352.pdf
    • https://techielingo.com/fck_uploads/files/nofamabuwuzitikinivoge.pdf
    • http://abwlargo.com/uploads/files/tugopoki.pdf
    • http://vonschickenconcord.com/uploads/files/tipaduseteweragasaru.pdf
    • https://happycolaborativo.com/uploads/files/70887905121.pdf
    • https://aksukartela.com/images_upload/files/fenijudugaserewokilebenap.pdf
    • http://arenabilardo.com/data/_files/86537305501.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7ed87a204c194e88adaa8c4b521fe796/vemigasononotevaweboje.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/lovedosefefolul.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad6cf401f---1475437105.pdf
    • https://sitarasign.ir/data/file/38599350864.pdf
    • http://s4l.vn/storage/ckfinder/files/zodexuloje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+usb+driver+free+download+for+windows+7
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8af.bin
013c04c752b57d44e3ce3a4db6fbd8718cea2ae4d853e0991f930ddc52ea84a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16360 bytes
font_01_sfnt_off00010324.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 16792 bytes