Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc19ef332504606…

MALICIOUS

PDF

95.0 KB Created: 2021-08-13 22:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39ef5512248481d519a09d0c34fafb39 SHA-1: c41a0458e15fdcb1e81341497ca5eed8e3c0c042 SHA-256: efc19ef332504606e66333401fac284962b5f1609e8ce867ef97122194220188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by multiple heuristics as a malicious PDF, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or scam campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/uplcv?utm_term=how+do+you+support+a+creator+on+roblox PDF link annotation
    • http://backkwang.com/userData/board/file/dinaxivipebamurudul.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/69223510363.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/jilasirimoxu.pdfIn PDF document text
    • http://axwelindia.com/uploads/vinemijenavogasisu.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/zimeledazas.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/jumutonevexusa.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610054f8c806c---vexogizelik.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/20445537315.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/70752959105.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/nifemuzajodozexurawegamu.pdfIn PDF document text
    • https://ms01bet.net/contents//files/63783020477.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/24c0e7c04b43ca7f844b338849d33e66/18651883518.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/37561304645.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5b7612f3dcf98dba0481b84d430909a4/76584542952.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/8826956374.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b556f96400c---33501501386.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/46017444204.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7da4c297---15444612160.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hb4c9137g65v291lvo9k3dpeo3/dofelogodujisijituduzopod.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d14f4f035---59595354124.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c936c9d9408---79890461514.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4004d569fde4b43ab770621a5467d6b5/55147083559.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/65086947650.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fizijutawesit.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/bikuta.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_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 17520 bytes
SHA-256: 40cd84790bde0d2b5dbe480226462fe0addb37e34d13fad8728aa1ba2ec0368e
font_02_sfnt_off0001542d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1542D 10948 bytes
SHA-256: 089299b4b34445d37380f94a660bd7cc78b709e2f9509ce2ea246321707ac8d7

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