Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bce0663e2b172e6…

MALICIOUS

PDF

88.9 KB Created: 2021-10-08 12:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 052acc0ab05970fc3a394220b85dba21 SHA-1: 2d3d34be409e36d8baae1161c50b31317528067f SHA-256: 6bce0663e2b172e6ed46ed664b610cbfb41658c3fb8ed8c582dae55891dcf9c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external links. Several heuristics indicate that these links point to compromised CMS uploads or are part of a link farm on disposable hosting, strongly suggesting a phishing or malicious redirection campaign. The embedded JavaScript likely facilitates the malicious activity, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://liebherr-tr.com/userfiles/file/4416013068.pdf In PDF document text
    • http://willbramephotography.com/desimakodetilorururoj.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xugowufe.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/zegipubofof.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/gaxeke.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3susa35fvhqsbi9257hr5a2o4h/larafowonokemupobavor.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/76324047163.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140d29059543---rewifuje.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/forejawumutabedinotodej.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ngqu7u99kbiq9vve3o6hdj99u2/73802568999.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/56481951762.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/lejonuzajoxedigaf.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/28e6d6ec7f57d7128527d52892efde6e/32282950490.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/nunozarejabojotiw.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/sabipimofukiwugonifuxosid.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/legogajagepo.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/bimukexiladusisi.pdfIn PDF document text
    • https://thepainter.asia/upload/files/towexemanazozi.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/47952386985.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/23544735995.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/62248738235.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/29850102357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fifty+shades+of+grey+written+byPDF 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_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 19988 bytes
SHA-256: 2e56d7b454f9d2f6c7c5c5cd82593b3382af0fe3274e4d0da5693eb7bcb2bcf5
font_02_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 10904 bytes
SHA-256: 605439270a108738c495de34ed07d8e39ed158d479ec3c9a3f4f52dbcdb45649

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