Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c93a6f6145ca2d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 13:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 309083dcdf575dbe2649eef604d783f1 SHA-1: c851b39abddee6b44abeb7f52717e6d70b66ac00 SHA-256: 25c93a6f6145ca2d1ef127e9a580676a7f24c55f4a5fd00ebfb936fced71faff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document is a link farm and employs a social engineering lure to trick users into installing a browser extension or update. The embedded URLs likely lead to further malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://crewmak.ru/uplcv?utm_term=how+to+stop+permissions+on+android+apps PDF link annotation
    • https://electroagro.es/pub/files/najadilivawinikagejizeri.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/dopuxarunuzorajota.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/26772968569.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/guwafubog.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/vesevixerujakubadanavulip.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/loxerusakinokixufoso.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1613c24719e526---18092981524.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/fovajonebemenubefizemeb.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/lipewukugabusoxi.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/66058485927.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/82462526032.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jinifupilosaxifode.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a69c3560869834bce571bd4915582e14/zerewig.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/suwagobu.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/33523645711.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/16098457564.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/37364251101.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/tubebubojiwumotabirenutu.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/xujavomomoxe.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/jubatufefejew.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4ru2nj36uk8toul3mvj6nkg44i/98998289730.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/64236367678.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/vipawu.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/kikidumotutuxupo.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_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10584 bytes
SHA-256: 842aa21c0d65344930483d3d4f4583794e762aca37b88c04f3ee29cdb3765a4a
font_02_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 17188 bytes
SHA-256: 30afcf87ede51d034d2c80c746f3507e7b8ae34d2e486994eba4908827aa6faa

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