Malicious PDF — malware analysis report

Static analysis result for SHA-256 e317877189f89a92…

MALICIOUS

PDF

83.7 KB Created: 2021-10-21 18:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0513efd22baa24c0d54de4b127472a6f SHA-1: c57957df6d1c958ab8ecda067344cf139173b98f SHA-256: e317877189f89a9299f2f2f16c9e4582363a06c32576b152fa4c58caf0b12055
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614593e9595f9---petizafofitozavimud.pdf In PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/65516555755.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/65953023778.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/musitodivivuvubenutoza.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161517e35dc1fb---nutanorevilerun.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/samuzele.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/48797701689.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/fezenir.pdfIn PDF document text
    • https://emmaushuis.org/pages/44461109277.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/parefamawoveluv.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161653df58e41d---sawazigonutevi.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/wafir.pdfIn PDF document text
    • https://premium-house.uz/images/file/70870289287.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/91652651617.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/12671492626.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/30423088264.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5eeb143a4---16744732448.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/meroxinozetofeji.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/nekimumipanun.pdfIn PDF document text
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/76888346126.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/dimavoz.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/weliwivenikaxuselenojes.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/44876520965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=systematic+and+regional+geographyPDF link annotation
    • 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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 17216 bytes
SHA-256: 5c7bb3cfd6eed720586e1ca83f42df65dea3f68ffe1845788a539105f52525e4
font_01_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 11148 bytes
SHA-256: 27b9ec0d3b4b0fee5af57822bdfe724b1265b8242bcafb18f8ff8954a163074c
font_02_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1