Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08b264970b3f4d8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 12:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59ca0e57af2ab69969de51cd712154ed SHA-1: 6ed70a760fca43bbe457ce9eff20088a7e848c02 SHA-256: a08b264970b3f4d89982c07f589e3788e9130cbfe1be0a7bd078dcc1ac4c67c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards exploitation of the PDF viewer to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://infrive.ru/uplcv?utm_term=flora+and+ulysses+free+ebook PDF link annotation
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/nunovanumademadaropelu.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/didexeg.pdfIn PDF document text
    • http://hak-al.com/resimler/files/49710972427.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/datifevogerujuxadajunit.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/joded.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/45370135444.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/xumudanobaduwozu.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/29119946631.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/gofoxezubeb.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161355ca86fe60---zozavimifasan.pdfIn PDF document text
    • http://cib.lin1.ca/phpsites/vertical_living/uploads/file/46023816416.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/70399810145.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/38049227973.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/a0fcb1497b7aa34603afb46cae588ebc/navewexekowof.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/92cb7f343b080ae2e70d8b3aef080266/gobasolaxiwupivigilure.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e952bc15e---90685777260.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7a306670---87736649012.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/21449529256.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/zemegutibeka.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/tilexivisovixivefem.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/vekadotozudemevofa.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/4721245470.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613284b639024---4451810084.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/dufijeg.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/jadod.pdfIn PDF document text
    • http://alkanboya.com/files/file///vokox.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaefa8b566---nutopelavuxekapuka.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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 10580 bytes
SHA-256: 6d174d3ef1a9f457290106c1a728f8e3e1e480361bd487d93889deed532379df
font_01_sfnt_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 17340 bytes
SHA-256: 6bf8ec72cc73b94f1213147a5fe45118ff35305ed219fade383c139ebfb2d507
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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