Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e578b9601c0d76…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 15:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a9f0a51c05a06dabbb76061147111b9 SHA-1: 6949b50cc6d288f2b6383cfcd5c05d753a168c30 SHA-256: 79e578b9601c0d76f07eb4c846df836514b499cb0416ee30df02211e563385cb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3070

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://noble-program.site/js/ckfinder/userfiles/files/zizizakuwofenezoxuwo.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tdj4ijf11no4sf7geqdr580sjp/jiwiwiw.pdfIn PDF document text
    • http://freetds.net/userfiles/file/845973000.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/74447216161.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/josodifowemumitolifuk.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eb258b6f8---mawaridu.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/vodebigop.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210909170957432714glhod.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f083e311b6---jefososuzex.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/mavemusakuvatut.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/bebovinij.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/devubomebix.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109122317517419.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vojibodefifewan.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/boxog.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/bokugidetamonaxafu.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/46185757285.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/37768099747.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/pixop.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139446c0802d---jaxevomuwu.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/vewaroxofiwusiwifevisa.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/11087309101.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/31379526773.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/88028783006.pdfIn PDF document text
    • http://fedime.org/imagenes/91985767648.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/mezutipixud.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/zavazelepow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=parallel+space+64+bit+support+litePDF 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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 10748 bytes
SHA-256: 41b286aa9be5523b704db3a01c9ff978c25c25dd4a20eee9147547b943be3ce0
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 20188 bytes
SHA-256: fb62574848d92dfbbeb3db4dad0654b50614a4d37811ffebbe44a948672be87e