Malicious PDF — malware analysis report

Static analysis result for SHA-256 1894f6bb3ee91ac3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 10:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f16634cb6ac2a3c8d9d55ff5e78edbc SHA-1: 5da0d5e5f0209d5645bd33e0cb271cf2c3ae2406 SHA-256: 1894f6bb3ee91ac39adaef18efe029bb9bbcf3bd22c86456cf82c79eb41444c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, often with UTM parameters, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=cricket+pitch+length+in+tamil
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5081864a98c237d8b05ef4e8b590eb64/ripojizuxu.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210905_F79283D0D7188342.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/48196921828.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7c106818ca44009742c5cffb585fa939/nudumugaredodeduzajagi.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a1c42f6ec429d68f6f53beb5d71ad2e5/48876084146.pdf
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/pijatebepazo.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf28e18a5a---dosukoso.pdf
    • http://jamesandsons.ca/userfiles/file/72277767509.pdf
    • https://cornwallstaffagency.com/userfiles/file/14180065324.pdf
    • http://canxetaianhduc.com/images/file/miguf.pdf
    • http://lechioutdoor.com/userfiles/file/59486466379.pdf
    • https://fontan-montag.ru/img/upload/20919278140.pdf
    • http://chinalabware.es/d/files/kisotejapenuzugetepi.pdf
    • http://nexxosrealty.com/userfiles/files/xuvebaxasokiletupewatupi.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/51365956360.pdf
    • https://pannonfinanz.eu/editor_up/95946705572.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/31994964474.pdf
    • http://okun.su/upload/file/96158299721.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613777b629447---zenonusejodunisorawu.pdf
    • http://sayurmateng.com/contents/files/6571615074.pdf
    • http://gbfrjournal.org/pds/userfiles/files/48812947810.pdf
    • https://detectiveoffice.net/userfiles/file/97860188776.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/dozixojanomovakifimavazex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d817.bin
6af954a9293ec720fae2fa0602705a41543f832ed6d116f8e3fbc9652b023f51
pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 18040 bytes
font_01_sfnt_off0001067f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16792 bytes
font_02_sfnt_off00011e96.bin
011407ffa802898a070a91d1f42457ee3f4c34fa5befc9780e64ef9af1b3ade9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E96 10656 bytes