Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6793bbf920acb6f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 06:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b7a9471000f5f6c5123ea2c49732499f SHA-1: 75c38c0f819342ce9520296e1731947f8dfc328c SHA-256: b6793bbf920acb6fc8fb307f14a1cf233c17b7d0bbbeeb56a39dbd98c7acb8a6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to exploit the user into visiting a compromised URL which then serves a malicious payload. The embedded JavaScript is likely responsible for executing the exploit or initiating the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/18412564665.pdf In PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/20212382192.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/39270381741.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/51c0a66b47e489a0310dea7af6bc9779/lumasujiku.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/13175760091.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/jidamudib.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/pojawedi.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/68a4137325cacbc40e9f02b1b17b9787/43847307055.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/16843332854.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67383063802.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0621a944---nuvelowobidujefulomedoga.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/soninofonosod.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/22108085424.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/20243824185.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/35306747812.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33eed5da8d---bokajuweke.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/96gpksd43l1u772634f0rgtbo4/fokiwudapiruvokuliluref.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/vebevufabotodugifowidulo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/121a6e1c92d0f32b3cfac3403919fc9e/56413890406.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3eebd9486b---4864162771.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/16369323669.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/26226021082.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/43226384969.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/winadutudifazunoxisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=inflation+since+2016PDF 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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 10640 bytes
SHA-256: 3e843225e5bdbb3d8d00e9a894b2dd8dd8969caac849e93368e4799882286fcb
font_02_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 16300 bytes
SHA-256: 643c348ddce0c933daecaf962ea4d8232fabf45ff280626cb8b32ebbca1aee5b

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