Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf70ce70b6f30be…

MALICIOUS

PDF

112.5 KB Created: 2021-07-31 19:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1a3986ac3d366b825489d3395f3dd124 SHA-1: 8090b09d93ae9275edbf9598c3a044e6f8966c68 SHA-256: bcf70ce70b6f30bee244c2feb3e1da86a558aaf962118fa749d36b41a29c860a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure itself is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=how+to+make+a+shooter+game+in+scratch+2021 PDF link annotation
    • http://ducthoaudio.com/upload/files/vimipopinumezil.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b2fd062e---38007098675.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/4014489996.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/vexixev.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082d73676a73---rofomiwipinesamuxetanofa.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bba5cbb857b---xagomavosidu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30d512740a---bisefejefe.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/jinuditukisuvuxiz.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace0a0d2686---tomeveduvevanetakinarixo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bomozomo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee16bb59c5c---gagavejipovo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6bcc0b9a---jaxukinuwo.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebd53c96c---92008042001.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/52536756572.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/82673483271.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/vuwivazabiluwepafo.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/76968877755.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb68fbc917---vasiranazegokozebiral.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/5s5qiqqt1ijcvq89oulksk50cr/zubitipebizenadus.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a3f34de33ea98738d403c6bc87f5eab1/32760703742.pdfIn PDF document text
    • http://alkanboya.com/files/file///22953282582.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/82455493b7f6ff1efa6ccdb060d3afee/logekij.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_off0001527e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527E 17908 bytes
SHA-256: e9b271f790676785b651b874f76c814ea35f8086f43a70f0fc254886a020d37a
font_01_sfnt_off000180e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E0 11096 bytes
SHA-256: 15bcf799e51677a37ce0c60e428e02d5638fe5a3d4b9eb390d040863effdec61
font_02_sfnt_off00019ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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