Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71a98f657490a00…

MALICIOUS

PDF

75.4 KB Created: 2021-09-22 13:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5635ea1d285d0d0a840ae14a2ae21f9e SHA-1: 837df7da1992a68baa418c1ddc10d46605e7f50c SHA-256: b71a98f657490a00aadf94afc04104e86aba2cb5cc0ebafbc40cc2dfd5b8a46a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate the redirection or download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=best+phone+price+in+sri+lanka PDF link annotation
    • http://tareeapartment.com/user_img/files/powujupabedolapojaju.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/12515265027.pdfIn PDF document text
    • http://chamdure.com/DATA/files/92610656489.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/19702884513.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/59627909087.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/38740621438.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/7848816583.pdfIn PDF document text
    • http://ux-school.ru/files/files/tokakupobojemekedexusawet.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a32aa5497de77375b49a20cd8a78d1e9/gezuwakadegatarozij.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c82149a9b---22402438340.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/bebevunimoborow.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/pifum.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ddc914ab0a0f20b3b7c32276b5c39e3b/fufujazegawozadagu.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nizigave.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/68023961936.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/67963574505.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/xavezesuxolopivi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa68dd483---13258005329.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/lubilazisutefamikupelif.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/28845840954.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/bamagovajazadarimexo.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/34343361635.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/tisameferi.pdfIn PDF document text
    • 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_off0000c1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C7 17660 bytes
SHA-256: 6076c5749b01cc0fa8903e1fe203a5e1605bd0fcb41e6f0b4f32acdf9706822f
font_01_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10616 bytes
SHA-256: 25c072a56cb0f8932e5b26b36d4c8d53872a06bb0407ee47fbc3e26f0d592f09

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