Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab12af60676eecd0…

MALICIOUS

PDF

73.4 KB Created: 2021-08-25 00:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c445a88d8d0334e5842c6e7dd7be4fe SHA-1: dcb6698fa3b55a269d8cdbfc243fc279e44fc110 SHA-256: ab12af60676eecd0a8d2e545cbe0b439ed77eea2fa4212bb3dbc039d9ae8ca38
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these indicate tactics used to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://biomassasia.net/data_ed/userfiles/file/21428118514.pdf In PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/36250213297.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e983vobr6vsh3871hq214fou8j/15733091391.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2debdb41670304c3794c2ead3e83e64a/boluwebojug.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f41ad1e35---bevune.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/46179900131.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f2256d24---zopiju.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1bd36e991---34605165730.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/jojuwekemabigonodan.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/73127227138.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0d1e38eb82137f01e3370c22ca4a3b02/munamoxivujeziwixowafaran.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/68508334324.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/mebisez.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/jebinasigewavanixevofodiw.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/dateb.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2401529c40---logafedafanogufizexa.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160948a0f12d33---20388565757.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/65361480557.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1daab80ba---16148240817.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/bad2d23833772be18ca34317ac172dc4/30787037792.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/bodutuzegasetimoxopusawel.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/73237474983.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/loberetevoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=industrial+shed+design+drawingsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3420c072acc515ff8033213ab66876e6/rudeseretokesojatobek.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 16912 bytes
SHA-256: fb527d4f3d0df0392821344f6e8c8ee53dcb3535270fc641e7655bdca401ae3b