Malicious PDF — malware analysis report

Static analysis result for SHA-256 446b70bec20fd3f6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 08:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1677892e983c54a2f95a099402a7914e SHA-1: 184b1a1a782aba43819336f8a95c7fa470560dd5 SHA-256: 446b70bec20fd3f618ee9253a3ed276dc9aee4cf58f73c4958992f74de9a7705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://irlanc.ru/uplcv?utm_term=matokeo+ya+kidato+cha+nne+2016+pdf PDF link annotation
    • http://fsoa.cn/userfiles/file/62969888670.pdfIn PDF document text
    • https://wsbtitan.com/images/file/werawovixotiza.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88fe908f2---masawodarozewoli.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/36e849eb6cb89eaaccada9019d58da76/93521833270.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/u7nid40t04tsr51issfk4o74lb/zegilisefemopapigasup.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac38e7d12c8---xiluginovakirijawibe.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050308355273499.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5175cdeef---zejuvakagijuve.pdfIn PDF document text
    • http://sdds.be/userfiles/file/61111305129.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/jixoxonejofuwitalujes.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eba3c5670---zudonononewowiwuvojelozuj.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/rabegojixururajukoze.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/jejagubavusaloju.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/gepoxonexibuf.pdfIn PDF document text
    • https://onlinendttraining.net/files/vuvurivakavo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3605d3c3e---31873579901.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7f8183df---rafubisemizewosuti.pdfIn PDF document text
    • http://esistore.be/userfiles/file/61277860345.pdfIn PDF document text
    • https://tavio.ru/files/file/17539869283.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c200eebf5946e0a09f2e44674d080d9d/75955055092.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/72336033906.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9ecaa77695f871254aa17ec96f99107c/46963920173.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/vafitebiwugidexevefav.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f683b9a215c129dc39993987b786092a/57339713082.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_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 18172 bytes
SHA-256: 766e61c0d1965eae52f90076b515d657e6a719c5ab8320afdd4e5609f6095b23
font_01_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 11064 bytes
SHA-256: f558d937105ed87a0f93a9e9f02a6bf26b3b1608361a6950291c8a8836d51f6f
font_02_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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