Malicious PDF — malware analysis report

Static analysis result for SHA-256 690c8252e8c2f162…

MALICIOUS

PDF

84.3 KB Created: 2021-09-22 16:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a23ebae47d0fa5e90cba309c0632a328 SHA-1: 9cd3ee2161602d1770b3188e5d94368350f51a68 SHA-256: 690c8252e8c2f1623538b541d1022197ac823c992ff10a7f5cc7d829129ad28f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for malicious redirection. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to direct users to potentially harmful content.

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://archism.ru/uplcv?utm_term=brooklyn+nine+nine+season+1+watch+online+free PDF link annotation
    • http://flapboxes.com/userfiles/files/79094636065.pdfIn PDF document text
    • https://olterus.info/contents/files/nafuvobimelekot.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/vizuv.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bufafofenowapijinu.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/vexadezobewobibopaditeto.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/kunuvip.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/kabogewonozofato.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/nojujivujapiwejuwuluwidin.pdfIn PDF document text
    • https://menu2uplus.com/images/file/31182095663.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/dizewezepe.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d313352f4f---35010109714.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/11948301232.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16804442196.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/44268164188.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/kejaxe.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/tajikogesofixavelikamere.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146027d27f17---xelitax.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/efce408d341a9a961b13d06d456a7be3/13373938744.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c5b9a5c0---babavajosipupapuno.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5d2b486d---56085616653.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/rabuwunamapimiziwifo.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090508465873499.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/45636650963.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/36941378332.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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 17500 bytes
SHA-256: 5925875fcffbe14a5124c5087eda748ab9328f643a9c5476d3a717ce71d1eef1
font_01_sfnt_off000111cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 10828 bytes
SHA-256: db1d2f2986ec284bd0d382b32b59f6f2392eb69910fd718785d7505653e157df
font_02_sfnt_off00012ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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