Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff46646aedadaee…

MALICIOUS

PDF

82.6 KB Created: 2021-09-02 15:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3af254e1c8dc337ebfd0e261a88edd44 SHA-1: 6bdabd2f5a7f8ea986d448f00e5ff578b3755713 SHA-256: fff46646aedadaee8ad766b78b27c7f4c387dd58c312ea2c0b9d19510cbcf5b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=expanding+and+simplifying+polynomial+expressions+worksheet PDF link annotation
    • https://srilangkapools.com/contents/files/pubeliwexumizibiwerisub.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/73179404927.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///tasoge.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/fosovin.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/panupaf.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/vituzeropuzewikalija.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/52295602414.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/duxofavizumonuraduxekevo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb9b6e2186---22970733139.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16081a07e1e9d8---tuforizitafe.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c4fdc2cda1f113f75f936a7ffb7d3425/zuniwiduwufek.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/17624397972.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/vazitofizakiru.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/zomijawoguzomotixeru.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/1734352649.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/gavorapalulixedulilulobab.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160741980688c0---rojifitumixamapare.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/75414838397.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d84e9c1a8ab---94882872184.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/f0ac7f5b081fa07470bd6d7477d64382/33019596057.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/bekobakozifopogavobixotij.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce77d77401---nifexedunakofilenisipoje.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a268b008467---68817310657.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/80278227839.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/notazodefifudakipudidile.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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 18204 bytes
SHA-256: 87fa43628cdc4c9410ce95b12657aba38283f29aeb6047d2093e0e67a61a7d4b
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 11324 bytes
SHA-256: 03ff39394ecf3b93271587681c0be10a53f89f5a9fbf47986969f318ba5935a5
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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