Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f4a018800a4c3b…

MALICIOUS

PDF

80.4 KB Created: 2021-08-21 18:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7f4e231b111ebc76b2d0d8e7d5e5a04 SHA-1: 256dd8e0b9489c6b026a3c689da9e7b1e88e4f97 SHA-256: 18f4a018800a4c3bc64b8c144b912d6cb87ac71df79022bf72e3ae5e0588fcb1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd9079441a---7001180244.pdf In PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/kagikakawegelab.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/kezabuvidomaxufipalaref.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/4790152225.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da69cfa31d5---23767342323.pdfIn PDF document text
    • http://sun-tes.ru/files/file/novifejujevenafoluvizanu.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28379551143.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1610d960089616---widigiriwoguzumumukupili.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/968a0c608fab79c2fcadd3bad142f6e9/lufugodinutobisopux.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/toziw.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/tinizebepuvuno.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ebace067---57639465969.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c110b0c325f---15664996706.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/6534b1cf101430b43a20951a5f45d3f6/80065590327.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8kvp1a2cmqv3e8ljv7ieacl37j/fuxogiwelubo.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/kegoxul.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/vegifulosuvek.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0e8e941c0c35882bdf8b8771028805c7/xizone.pdfIn PDF document text
    • https://hirurgija.me//files/41368108160.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/padafimodi.pdfIn PDF document text
    • https://tigapilar.com/upload/files/68931714102.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/bupuxufadodu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609046de39cb1---kobusuverinus.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e18134a705ee46999fdb81219ef2dbc6/jogotepifovev.pdfIn PDF document text
    • http://bronia.org/userfiles/file/29158960856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=muqabla+song+download+mp3+dj+pagalworldPDF 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_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 11180 bytes
SHA-256: b039dea22725ef4dbb819c64ed91634eba16390f3ec2e53a7680749f47a3be61
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 16924 bytes
SHA-256: cc38fc0c834f06224b8cca5a1bac5e2743198d6b298bda5e1fa2f92048508288
font_02_sfnt_off00012a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1