Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c738fff6e6e2ed0…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 00:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4012e1e0fa5f3db5811f97a393445cb9 SHA-1: 3d24a9a9c44407aeb2e54cda168d9574966d5ec6 SHA-256: 5c738fff6e6e2ed034c08588b05653388cf6b15ef52cde0b93501f54d6bb85ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs, many hosted on disposable or compromised domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://123natura.com/stockages/files/fumanebuxajasukunot.pdf In PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/29829681596.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/6950988558.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a943a1dc7a7---vupusajik.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/vovudaba.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/jalililegaz.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/19242773583.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/176063181060cc04c5268e2.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/42937888348.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/litumisiboroporokazew.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/58584929167.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/gofiliferaralavufikes.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/lakuwukobefemaviko.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/54169650594.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/1b887df3c5b05bee9fa0279c4ac78e4a/jakob.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/miruwapajekovog.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/139afa282c44f9f76a2323bac703f809/59950205450.pdfIn PDF document text
    • https://designclarf.it/file/20946776871.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c4ebde9be---30657322423.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xovulomub.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc34f150e6---57769952477.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/wonasusewuronexejiniwufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=whole+life+insurance+vs+term+insurance+worksheet+answersPDF 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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 10940 bytes
SHA-256: a3a9841a8975a20877bd1415cc900dc87519349787b5a6b7f39b9244fd2878ce
font_01_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 17504 bytes
SHA-256: d9c4ba8f67d461e4ec22cc447580a23ee8da3e6786ae54f99a160126faa125c3
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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