Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dd703547cd4ddf…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 11:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1a9b50f5cbb860384ef4dc59aa564a8 SHA-1: 53c13c1c84b64840990e7c9075a895e13f11b637 SHA-256: 12dd703547cd4ddf23c520ef5a817e20b176a68abf87c6bae6690e701a07fe9c
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the presence of numerous links to potentially compromised or disposable hosting sites, combined with the lure, points to a phishing or malware distribution scheme. The document's structure and embedded links are consistent with a phishing attack aiming to exploit user trust for credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://alburigiott.it/userfiles/files/sexijuzi.pdf In PDF document text
    • https://liur-krd.ru/userfiles/file/88921360028.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/52422068289.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/matamexufibolonipuf.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29d813c668f826e8a6a9b4e7d2c1f70f/66926970000.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/xetulodutinupumowiju.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/zisejuxirexujub.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109102207589697.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/45540925497.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/tejabolaxesexubilese.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/33e4fa4fa9583dbb3457adbabec8586d/visuzoxixepedejezenewom.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909014910447.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e929dafdcb---33893947019.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/70722331912.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/96365604690.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55787113586.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df4615677b---88251839444.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/daduzopa.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba650f2a57---71204494506.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338342340ca---pofoxobe.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/14681679096.pdfIn PDF document text
    • https://udruga-invalida.hr/files/fisafajoxuvom.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/xutofetopax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dark+mode+phone+appPDF 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_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 18316 bytes
SHA-256: 28857ba0dd26264cec230a08ee88c66f7c4f7914eabb04ea164104e2120f510f
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 10344 bytes
SHA-256: 9dfa20f4b12cabed30cadf7d027a409fb89319dac2c9d8a43da2ffd2f078e802
font_02_sfnt_off00012db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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