Malicious PDF — malware analysis report

Static analysis result for SHA-256 240b079084fdf83d…

MALICIOUS

PDF

95.7 KB Created: 2021-09-07 11:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5dd69016927793405ae78cf31dc35e2b SHA-1: 51deb71a92a62cd142977e1eceb292c726e37ee0 SHA-256: 240b079084fdf83d003be3c63665c170e145c8cb8db292b1d2231aa4b9d3b084
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8adbb2ea9a1159c1eb6e17bacd1849ce/jamebabubika.pdf In PDF document text
    • https://seikico.net/img-tym/files/38158692586.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/95102319120.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e207a9fbb---fezalezomuvotevokona.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae037bf4c3---59894049858.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cbb0e35e---72181991015.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d18d9304d9---webotikiwa.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210623034711400599.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a41a318678e1a541c629724c7b5215ca/87153863822.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/78311031005.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/5475105029.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/15938482339.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/47457355220.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/42d7e658534a1f8d53a799fb7f398486/vuranajalaromabeti.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s4pabcmp70log5bov6m0tf3prs/dopimamovepepetisedumix.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7aee0ef612---7036597768.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/t4fbrmjsu107gadi7998kk6bn0/81874327932.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/66554883772.pdfIn PDF document text
    • http://caramelitos.sk/files/putofukojuzateju.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/14578365081.pdfIn PDF document text
    • http://jcpingie.be/public/files/65827849873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=review+of+related+literature+and+studies+sample+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off00010f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F06 10956 bytes
SHA-256: 09302198df4b8698196179b8611bfe951dc6c9de7a4c887dca07170b317d2ddb
font_01_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 18592 bytes
SHA-256: 5e972fbb8852464404b66b2ae2b867ee0a4c0ea2cc5b49f894c680a5bacc6972
font_02_sfnt_off00015915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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