Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c97d713c2c93e8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 08:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d26a12dbfc450648d77a8fd6b4e5f5f7 SHA-1: 68697cdd5bbceff4aef3493133806a8188c5fe6d SHA-256: 20c97d713c2c93e8d0dee05aec662164a2eeda9545b3ff171d00b6cd4d26a3e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, potentially directing users to compromised websites or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://u-spot.biz/js/ckfinder/userfiles/files/54902834572.pdf In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/a85791f5ffd2b1eadb1f1aa68a02b597/82706815994.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/38242745360c004f790bb6.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/mibabozudirovag.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/79882710053.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/fb2a075e17d8a79362dc03abfa545213/roxobabawavove.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d3f687e7f---24001261262.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/22488418233.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210826200155_2acd0c.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/54900522469.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/75490505355.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/kukabupotedimedexemo.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/fozejen.pdfIn PDF document text
    • http://swhos.com/upload/files/vasomox.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/gesizaferajutemezege.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/4316179416.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089374cc18e3---38048451184.pdfIn PDF document text
    • http://winso.tw/userfiles/file/52713265920.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210519134150.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/72rq1b3d0tgoihdb0qee5rmca5/2508326075.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/126uh4ml129euo7uhgsitjjj8v/86635499747.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16101408831a37---64193829531.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85036374f2---56132892592.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/sarovudemupof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2018+spelling+bee+word+list+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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 18188 bytes
SHA-256: 882e4b2b01088d6ac36de39fe56a9ed693c2e2ee2db0b2bffc46c2886ab32511
font_02_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 11144 bytes
SHA-256: ae625f4c7e248ced232d0174014e8c98ef98f7cd660918a0b4f9d55f13e49af9

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