Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fe51d3bb94dbea…

MALICIOUS

PDF

97.4 KB Created: 2021-08-13 22:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ebdc62d9521b0945f70e0ace2e748b7 SHA-1: 2079fd19073ef94194271c93814559849b87dc4d SHA-256: 20fe51d3bb94dbea00a9a139175f1114f9979f23746cb3c4c969055f546111b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://philabc.ru/uplcv?utm_term=is+the+mini+14+a+good+hunting+rifle PDF link annotation
    • http://lso-msm.fr/userfiles/file/makoji.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/dc8e249e23b936291fedc5481dc7a1fc/joviwevagoxivul.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/fut1gf13baq6eohoi7du4sng97/welati.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/6752060825.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/8599692702.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/1023239239.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/742e12752126e0d1993115bcec4fa028/35235565475.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/c070cf38674009167ac144220c7de9c6/dukamoturuba.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/22910583356.pdfIn PDF document text
    • https://badrivishal.com/media/13587309593.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/bf0f88b6224ef898cded71ebc8cb7a89/zoxefosamifukevaguwu.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/15629152816.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/makoderejotelafugel.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/tidoxirajixujedi.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/672966325.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jhc6gonel2abvks4k63lqmssm5/19864157482.pdfIn PDF document text
    • http://simonide.org/userfiles/file/99887425446.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160828afcaac5e---gewaludadijoselenas.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62beb0560c---gavifupofukewokumiduba.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b23bd24cfc3---27580659334.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/43990613858.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/0beff3.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/temub.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160717de31524c---jigikirabonapiwip.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fc537330e0f2d0f3c23b70bf6d587e2a/tufekuneboxexezo.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/88026833685.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_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 10984 bytes
SHA-256: 11b50768dc985b4e7e4a7c8e0572b98cb0bcf24812c44cec2564302223d829fe
font_01_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001497a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497A 16668 bytes
SHA-256: 1beff91396a98a1b961d8e73a357ddc652f5c2f61be7def9ba53b1845a3c465c