Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7159a76216d8207…

MALICIOUS

PDF

81.1 KB Created: 2021-08-01 09:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6870b7e8a3c3cfef625c43b737f70526 SHA-1: 6cd34b9d003902edae1d74a8e18ef5b37a61783c SHA-256: b7159a76216d82074c375a3618cdef50fd3f7ba6b4c198d790123312977b5851
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The presence of embedded JavaScript suggests potential for malicious code execution, likely to redirect users to malicious sites or download further payloads. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7657

Heuristics 7

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f7315327---47373158305.pdf In PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/75528551004.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99bd4b56b---19733351291.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/75962471726.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/numaxabuxezujajofisusiwel.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/98968997323.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/jiwuwuvutofupujarel.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/bugopivufugaxovapitesis.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/46484677433.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094567027a06---devixawozef.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/ditirujobipiluduvil.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/lekir.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/13767488695.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d862912b970b3a405d1b278d00a16a67/83743003379.pdfIn PDF document text
    • https://telenovella-bg.com/files/91248311714.pdfIn PDF document text
    • https://activepymes.com/pub/file/13633268335.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/pepanolupipuwunaxevazalav.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/pefofox.pdfIn PDF document text
    • https://o-dance.com/upload/files/loxogizo.pdfIn PDF document text
    • https://ptogel2.com/contents//files/minojizalitid.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/zixeluxufazeredesa.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rdog5t71rfb5ucfk41gmi904l2/87435376520.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/45846881623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+calculate+compound+interest+twice+a+yearPDF 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_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 16804 bytes
SHA-256: f1e27ec83daf8b878c2ba0dbc5b304fb4d3d7f2575e02815d307395ef55f7a90
font_01_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 10964 bytes
SHA-256: 78d16fe758a7cacc7452a7beef06e0fb0d5aff5c35f9f22de90c1058bc0d882b
font_02_sfnt_off00012bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1