Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fc36a47b2478bd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 11:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e98f1555726faccfca56e34ce9e6a4b6 SHA-1: e5eeaefed189a5bb195994eaeb4ca2d21e7c3243 SHA-256: 24fc36a47b2478bd210e373f8a5b020f7f8df0f9778d1b666d1163f52e3277c1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://laborke.ru/uplcv?utm_term=psn+gift+card+generator PDF link annotation
    • https://cnc-ar.ro/files/file/xakebax.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/98256173373.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/zejivifipapi.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/nibaduxisugowidanuwezuse.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/63669885670.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/50736184888.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/lusubirum.pdfIn PDF document text
    • https://remini.hu/userfiles/file/57783252247.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m43s3bfrm8pm4b9h88cd3979d4/33421405998.pdfIn PDF document text
    • http://isvpro.com/custom/files/72397170517.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/1115143218.pdfIn PDF document text
    • http://mamitobe.ru/files/file/60256296042.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fef77b0f8---fisugonujidowipililutap.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/11498720128.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630696286bAmK.pdfIn PDF document text
    • http://vanhacollection.com/images/files/34217022738.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/nagevo.pdfIn PDF document text
    • http://iltorg.ru/upload/file/desam.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/dibobamalukiji.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/lojogeguxememaxopokufuwok.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6493061d5c405bff4b760703cd352ed5/bukowi.pdfIn PDF document text
    • http://falconltd.pl/cache/file/7226225325.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/19881321360.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613600c9eae7a---gazej.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/pekebataxalategubiwa.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/tatemuzukukatiselaw.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/19019703452.pdfIn PDF document text
    • 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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 17632 bytes
SHA-256: a7226f7f6efa6464c8274f8659a6cb7623460b93d4b6761a694a5625188680be
font_01_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 10604 bytes
SHA-256: dba6c16e145f03aaa53a38192a67123a8f85dc792bb427a36a4fbff66cc03cce
font_02_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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