Malicious PDF — malware analysis report

Static analysis result for SHA-256 57883ea9ee4b029f…

MALICIOUS

PDF

66.4 KB Created: 2021-09-01 09:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27b244adbf48ac6f51bdc1ab73aac959 SHA-1: 473ef979f288b614f1a1e36a97856111963b3d46 SHA-256: 57883ea9ee4b029f4cee90d1799f16f210d7f10dd7e00517c49475ce7fa16aad
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript which is used to redirect to a link farm hosted on multiple distinct domains, some of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is the primary mechanism for executing the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8520

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ufnk.fr/app/webroot/files/file/30552335739.pdf In PDF document text
    • http://starinviter.com/ckimagefiles/dimuzepave.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/61568006458.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/56157441048.pdfIn PDF document text
    • http://redactron.com/userfiles/file/43373574223.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/71077796320.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/84439957918.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/8436949362.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pimusevirekozifadu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/99363172363.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/50d193c09fe3121c66e7f546c70d7566/zazuzuzo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d9f12bc1---fokolukevenudebibotasafe.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/razuzo.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/jarokepexupazeguxadalipej.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/42435177107.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160928f95e562f---jufaxutozofewimeminig.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/76719734893.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/veutvffl8ad2objkenhe10grou/80018929501.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/967aec1debcc1efdd4db4e023f40a3cf/44830165799.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc1aef3593---76112056922.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940a5c4a141---ketavuvadi.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/sowamedap.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1e55602a---sotejaju.pdfIn PDF document text
    • https://renault-service.com/userfiles/fepepomusajidewobunopa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fd115d9c6---nijas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cross+elasticity+of+complementary+goodsPDF link annotation
    • 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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 11108 bytes
SHA-256: 998090df1f856516b35ea461c68588e16385700ef1f13990d2d8ee726004a17e