Malicious PDF — malware analysis report

Static analysis result for SHA-256 615e3be4baf522cf…

MALICIOUS

PDF

71.6 KB Created: 2021-09-14 02:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a2abbd2d7e790b27c00199a3eb266a4 SHA-1: a7de63a09782f8179b2ccc8f53bd5c1ae63ad22b SHA-256: 615e3be4baf522cf6ced52eb951d27bc6218c5d2ceb10a9d8632019dc3f77253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://ceccarbotosani.ro/userfiles/file/sedutuvujeneletuwavokege.pdf In PDF document text
    • https://dpengineers.info/admin/userfiles/file/30597066163.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/palel.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c0ac3873---monuve.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/51740806921.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/28071535961.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161361e2fba341---52115754593.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/tofubupejedisexane.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/xelonegakinizasimirez.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/51807318343.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/wegixa.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b7e98a5f0617be422288ee08c0f3059a/xexotizegusonuvabutiwusov.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/gazujojeme.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210910093849.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/93074056145.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/gonodejadizopelizudi.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210912121621.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jinekipitilimuziteka.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/xavufa.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/budadomelaviximumu.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mezuzaxi.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/582a1cba2c667e81c53bbdcd87e2ba26/nolizawibebibijata.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/5972998543.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/rofunevagof.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139df8cd203e---36340380142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+delete+create+room+on+messengerPDF 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_off0000b64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64E 10700 bytes
SHA-256: 55d5d4ec6dc8edba5da60a088d84914628a655fa6d4f8697769fbdb5d106c0ee
font_01_sfnt_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 16408 bytes
SHA-256: 9da2cf577e21e0444d30ef8ed17707656152b7083454b2f016cb1f9edf7c103a
font_02_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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