Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f6ae510666ffde…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 02:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 348e6d018aa4d1d73c28d236c293f8cf SHA-1: 9f81f9c53f4505688fa0312a6ff2d811624df32d SHA-256: d1f6ae510666ffde26c9cfd3c3b556aad20e0bfd28d9bcffbf80271811c3a678
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=microbial+production+of+citric+acid+pdf PDF link annotation
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/96830092ce79d8d6f2125babe3d2b4b5/96511876221.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/tezeme.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/zojajuk.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/konelenumawagamodovid.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/kikasepet.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9877f5b207---gefazosexowifivo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105191938291864640twpmr.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/29552807454.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xirodavobez.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/89447332492.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/befireruge.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/6739828825.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d585e8f4ad---pakawulijemos.pdfIn PDF document text
    • http://nprofit.hk/userfiles/16649312047.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/povaxofevixedi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32f53b447---zimilasevawo.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/70977159916.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/64670283553.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/balexu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e57f17df---dafopewujenatumepuzob.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce7a22be1---numufukuladumisizo.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/sagolatimikajuxabog.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q1uehufl4ievo7ma0upqp9shbn/91327925512.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_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 10548 bytes
SHA-256: 793fa8f293cb15f13d23d763e5b451ccb743d4dcaab86cf3d7ccc714ff039ded
font_01_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 19100 bytes
SHA-256: f3ea63b9a1969d95d98b36752dc0bee35ebe1dca53e05dd49d02df33fe8b8c4f
font_02_sfnt_off000135d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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