Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9258d046afe7502…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 16:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1eec519285ebada2f5ac90f5b19c3338 SHA-1: 8cba4498da7560a10bbbc6b5b3734df4e38a8383 SHA-256: e9258d046afe7502c50c7959984625a1995760589dfcac936a637a85fb06b5ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it contains a link farm hosted on compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the nature of the URLs and the detection suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba1030570---58091805325.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/98279286221.pdf
    • http://aitrans.cn/UploadFile/file/F1202105300850434073.pdf
    • http://jjmcp.jp/userfiles/Image/file/xulikitorenofipas.pdf
    • http://domholidays.com/userfiles/file/sogepomonarosamozobubejit.pdf
    • http://inezorviskids.com/clients/37546/File/75993941242.pdf
    • http://climacom.eu/userfiles/files/28913347672.pdf
    • https://anukulagrotech.com/userfiles/file/83766365816.pdf
    • https://grandhotelushba.com/userfiles/file/vidawebasisukugemogibar.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16099abc65fed4---22194910699.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801eaa649b2---13098708577.pdf
    • https://selltoob.in/ci/userfiles/files/22298594387.pdf
    • http://ateliergermain.net/sites/default/files/file/24823583030.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/146c48770d720d3fb75b0dc6a77ad69b/vaxegala.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca5c5c58f2---sepina.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd8eb058fd---jirilovi.pdf
    • http://yi-xiang-yuan.com/CKEdit/upload/files/benewevinosakubenabizen.pdf
    • http://ahxxzx.com/userfiles/202105/file/lemadaviworizolit.pdf
    • http://ilturismoinitalia.it/userfiles/files/raluferud.pdf
    • http://csc-021.com/userfiles/file/20210619031144_bxp9d5.pdf
    • http://dd-eng.com/files/files/zurore.pdf
    • http://gsmontaggi.it/userfiles/files/bakapurazopumifoluludakel.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a244be6a170---93786707237.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/82556242906.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=file+converter+pdf+to+jpg+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d293.bin
1879233e44bcfbc588ed469e71e5a5b9ed70fd6ed9b7d11e615e7a8ef6f7b901
pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 16404 bytes
font_01_sfnt_off0000fd37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
font_02_sfnt_off0001154e.bin
b7c4b3f4f1116fe2e496df255ef7d7dc88eedf45812e6f72f7e6b5829aafc082
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 10636 bytes