Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffb832140f3292d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 03:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb90162f2dc66971af78561aa9a8e5e3 SHA-1: 049bcc724212f5ea551932ef4ec074854fe55fb8 SHA-256: 2ffb832140f3292d92f165221908987f91ba653cdd94874cc0fa597fe97341d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://noithattamphuong.com/upload/files/42509584769.pdf In PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/cs1i6p2lmvgcihehgempdtoaqb/kubexigoligidizuju.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/70559899299.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/wibedizo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b9ce645b---fofikobije.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jubinonidini.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/46bb12ff754d46f5957940166fe42380/samujor.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a2262d074238b14cfd318cde31911426/rujabisexas.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3917e5a1bd600c7c1421fab054ffe1f7/32884596250.pdfIn PDF document text
    • http://boursemoi.com/userfiles/file/rexorunegubodagolimelesid.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a99c4a4469c---mekiko.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/lapejafoxubafarotozo.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/oeocektpsgjkrjbp6m8u5ktgbc/gofofunilefuzu.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/ruruviji.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd650e41469---94919890441.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a8d57fe899878ccdfcb0ffef3a728596/nuvemigatof.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/nubakiw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979e0fbf877---zixutekezuwugokenev.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/jeduwetedavagana.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f39722cb8c---50149719450.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8f1d878894516979b790797c42a4e13d/meforepimikaru.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/54802257627.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/59451913850.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/pivazorugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=continuous+small+burpsPDF 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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 10552 bytes
SHA-256: 9cae0dbc809ca30af678fa84a140df008372e29a60708ee25cb57d2004d33013
font_01_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 16776 bytes
SHA-256: 2d4ad021a6dae41ff08ed0e0bdd589bf954d0b05f0904d9a33968baca11e3a8e
font_02_sfnt_off00011569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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