Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25da84f0b15b1b4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 14:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 791225d64b9b4668759adaf7026a4ca8 SHA-1: d237bf1512ea4b1a93e61b14741502356cae65e2 SHA-256: f25da84f0b15b1b451bd05225a70ec5db2b9ad01f9f3d6223697c27a67bb6296
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF containing an embedded JavaScript stream and a link farm. The link farm points to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious code or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://thuaphatlaihanoi.net/uploads/files/xibagarabixotuvalosumawiw.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/kipejujupifofow.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/22654266532.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/98443736819.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/9166522401.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/1737858968.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/40463500297.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/bebirerutisewepomul.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/69780f6a654d90c0dace18ff1117d0a0/tenevosetawizewudo.pdfIn PDF document text
    • https://nada70.org/userfiles/file/jofufekeputuruxose.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/kuzosodipokajetes.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/033a5mc2toe4iiurmqm2kctqk5/kakefupexovabejaw.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16112c38a93e8f---tunubewesipajamizakokum.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/banobase.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/tufuweduzisibexajur.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/kejizesitusijolu.pdfIn PDF document text
    • https://domilot.com/uploader/files/35591459029.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/kobinudu.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/bigirafovupilitatuw.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/91614544683.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3rtjtu06gauhue4s4tsdkk69tc/motodu.pdfIn PDF document text
    • http://stroi-sistema.ru/img/37420731599.pdfIn PDF document text
    • http://dfanchem.com/upload/files/zedewefome.pdfIn PDF document text
    • http://citra.cl/userfiles/file/42248246212.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/7037417932.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6f12b38115e88c57ca57cbafdd75171f/61714946842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=h+y+t+pdfPDF 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_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 9672 bytes
SHA-256: 9a572ab44f2288c3a5cdb2216029311c95647dbc4cf7e1241ed443b8f2976b9b
font_01_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 20484 bytes
SHA-256: 7c9dca6426653e5ea4b4907dfd82d25bc6e1f564fd5698e97e59faa64423f0d0

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