Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5e8d1315b47fd7…

MALICIOUS

PDF

84.1 KB Created: 2021-08-14 00:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c7bd274bfb9e4b51a4f3e69f128999f SHA-1: 16bd1ea3606d0b0988162bd243a015a766279103 SHA-256: dd5e8d1315b47fd70353f18d6ad7d6434e6ab000072c81d66330c3323a7ae082
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 Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous external links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=dance+of+the+sugar+plum+fairy+piano+letters PDF link annotation
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071720c8e3d7---riradanofolaxamolopiso.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/d0lt0flb9vobhbk1dfvo7o5cn2/63598031263.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062415061973499.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/xozuseladitebusuzik.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6i09ocpe2bi3vcme7fm36mjiva/zutedipem.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021073112205773499.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/dixutavonigilaxujojodu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4e447fb3---guwiz.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f7169f176---xuragexibiwoge.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e74487fabaac8bc9ae286b286c4dd70f/48566022235.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608487a36baf1---muwodobaru.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/149c9cdbbe709972e58853b99d679d5d/99916458799.pdfIn PDF document text
    • http://kbchina.de/upload/61136860509.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/49487806192.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462480e5ac---5020811552.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/toc8695n622v32ct0oca3e5hc0/50458095319.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/43422748006.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/f02d40b8ea0aaa9df1f9d9258642f93a/walosejirelelita.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/pepikitixutunatonelubuvi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zifivuwa.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/fumagemaj.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071e3bbc4cfc---wafeji.pdfIn PDF document text
    • http://3asoft.vn/img/files/17961251141.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_off0000da82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA82 11144 bytes
SHA-256: 5022e451e0d2e7252abe3defa439b911e0ee60f0a6e6708fde626a4d41769eb0
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C74 21316 bytes
SHA-256: a7cf73ce0c8eec4447bea7930c50a556cb8f7d0e9f2eb256ed97727a10047471

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