Malicious PDF — malware analysis report

Static analysis result for SHA-256 e314310bf59225ed…

MALICIOUS

PDF

80.0 KB Created: 2021-06-28 20:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f41111bef4c85143ad6e2afc4e04f94 SHA-1: a7518501e31770c54d6a6449561b7518ce684118 SHA-256: e314310bf59225ed9a3750768d72892c3c2b40f062c563af3779e2a93470dbc8
124 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting domains. The embedded URLs and the overall structure suggest an attempt to distribute phishing content or malware by leveraging these external resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

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://crysiq.ru/uplcv?utm_term=dog+breeds+with+curly+tails+and+floppy+ears PDF link annotation
    • http://abwmarlboropike.com/uploads/files/55614333145.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/4063958118.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/33999991121.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bd7487429---87623966529.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d83d017060---lumivisuf.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6739fb28---xivigeras.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8a279b24---20269732685.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c1c06136---dusorapilarapem.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/08fd677d235d9ec4a18404b86ed9d0fe/42767947136.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/05e06c8ba0a6a62b5427a6656e4f99b6/91444550124.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607461e89319f---vixojupux.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sufozi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f0d19b96---46065731551.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/nugilajobexefuremo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16098396287ba0---romigaxenemu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/lirutaliroju.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/289d252a20df64b9130d74d0093386a1/41285000370.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/4339478460aa61367ef67.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24742acf9---25665935905.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/kupekogara.pdfIn PDF document text
    • http://df-2.de/images/daten/file/7645071426.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f0a19851af92a4f9435bd02e604ddd67/nojivuwezuxobekosadaz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/94b5df6357f2bcf3c9682bc4da5706b5/40649813099.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a2d30285f---85677074472.pdfIn PDF document text
    • 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_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 11340 bytes
SHA-256: 8064b3043c5bb401b5f47647b3cff516c72f1365d476a28489800c2c55212724
font_01_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1