Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0bca479d976e05…

MALICIOUS

PDF

83.2 KB Created: 2021-07-24 03:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb6834e00684f3783fce26062a6bf276 SHA-1: 9c1cc915372271458a6d770c7f934cb66cddc625 SHA-256: db0bca479d976e0517c2fd39499258ad2351a11ed1e7c8b82a866b78f77e0b1a
124 Risk Score

Malware Insights

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

The PDF file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4092

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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075e92a5609e---16098662183.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607988ba872fc---55381061936.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efea82fec7---dabasenejigikujegeku.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/polamajepasomavimeno.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210630114305_1261788246.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/24699110475.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ecf69b9b9---degejezoso.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/62615220689.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b022df8dab6---86926910205.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c77601794b88c4b4a7677242b357653d/19430370701.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/12759324190.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/44778300439.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092e7eb7f81e---65873791257.pdfIn PDF document text
    • http://bakoca.hu/files/file/kegunarejigonejomoromepo.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609217cbe3279---dudemamipexu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e3c3cefe68ebe234e0b66c7b16ee2380/pexoke.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/58103417926.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/77259151557.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/42e995367df81cbaff7393f30e9408ca/50180884138.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/37740a35ca8f9762cf670701700b8fd4/zonax.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074fbc61d442---bowigetisolisaj.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nis2gngliijl1e674l6hlh2be7/27126367996.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dddcb48355---bilivanigagevik.pdfIn PDF document text
    • http://qca.ch/userfiles/file/23387000035.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48266389253.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ceddd9d653206d089b9658cbef90cae1/38586986701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=los+patitos+feos+resumenPDF link annotation
    • 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_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 18076 bytes
SHA-256: 5e576c2bfe8703a24d8596ce72981568df3278b9a3f6ac8d3351da1ddcdb74ca