Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b5f7a285327926…

MALICIOUS

PDF

85.4 KB Created: 2021-09-15 12:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1fbbc7fd57dc523588823e8546d2f92 SHA-1: 57f172c139521b3fcf9496bc26d21ca6f6d9ec70 SHA-256: e0b5f7a285327926ac864eb47a56c0ffb434d453b69892c31eea1587cf920ced
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload storage. The presence of a 'download button' heuristic further suggests a lure to download a payload. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=android+device+not+compatible+with+app PDF link annotation
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/601937064.pdfIn PDF document text
    • http://benetalent.com/upload/files/finarewolopomusare.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e63fc33c86---18702390906.pdfIn PDF document text
    • http://le383.com/uploads/files/bagubaduxavibaselejeb.pdfIn PDF document text
    • http://cascad-trans.ru/files/fekege.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/4652812366.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416462b3944---xetivopiloxamokinupaz.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/wuwexes.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/kofokebomagedimesuzixat.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/55248274829.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/71658206670.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec75f10462---82613309401.pdfIn PDF document text
    • https://kaisar168.com/contents/files/70112785400.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/besomubujefifatomim.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614175a9015c4---femanonimefu.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/37607737473.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613672b8a288d---wubazikuwemisedukilati.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/belun.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/11465889674.pdfIn PDF document text
    • http://schokozentrale.de/idata/jedoberavifol.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/58168168163.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5ef086d9e4dc8a77927c4a0420e1343e/wefowelawaresaseg.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/07090411699.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/pujerakezunavinovodokasal.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_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 17988 bytes
SHA-256: b2253fb951bc0c0f66fc4d5003cfc87ba8f91456be6d32b47348e27e79c77a86
font_01_sfnt_off000116a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 10884 bytes
SHA-256: cd59a4127c1c4ef877f865815afea6a645bf326ee23f773d6bfda2504d148cb5

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