Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c710f2a94796a57…

MALICIOUS

PDF

81.3 KB Created: 2021-07-01 20:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 47a228550a3afad314f9c2b6a86d1f2d SHA-1: 0afdab001fd97d5ff975b141a3cdd018d24783d7 SHA-256: 5c710f2a94796a5718c2e48ac5e53531d75fcd1666d9d39c6017b09c531c108b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malicious content distributor. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to compromised CMS uploads and link farms, suggesting an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8abe5c8c99d537b32bd220e02c5fa778/sozozorutojujopuk.pdf In PDF document text
    • http://ahkjt.com/upfile/file/35633855424.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/621r4hvqs6sfp4cn9h6mfueer3/39751912265.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/33295653896.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094060528405---25597407981.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/nawurafes.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/cc1f8a422ac152627b81b5fed4888bfb/nigirele.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/sjco2q79bjigm55uf1rvlmv0j7/26168381167.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/de2b478737281b6e3c592a8cf98112fb/lipuzekopilegizutef.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/74850418589.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af07fbc15bd---vemurariziduxuwujus.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2bbead412145a1ca37be80311005ebc2/2996440481.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/58144687450.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/02065ddd45b7d37629d208a40aeacd4b/28829776890.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/safawitejupabuvodibovawex.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/dukikuraloluviro.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pju58ooo3vmepkcsonjk1gdc7o/manusevajawabozegipakizo.pdfIn PDF document text
    • http://519pf.com/userfiles/files/81795984767.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210605_191950.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/857e425467c99b0c898002b9c2708e87/71639306129.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8b8ff6ffb6e09b96cd7c3b557db0eed6/xenazejiwaxozuvofijakoku.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4fe54a149---lekoxe.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dcbdd913d0e86c4dbb8078cf3ca2502/dojesujipomowovo.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/wojodezekabaguxorugupawo.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/89763900929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mental+ability+books+in+kannada+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 16508 bytes
SHA-256: 769942884e4d381c394e19081ee48897751ba3127cc30a320accb1ac0b98b9ef
font_02_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10916 bytes
SHA-256: 11b5c6677062565ca5592f8090192aa9ee115c36c56d41278b09fab8f4e4a28c
font_03_sfnt_off00010b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B12 16896 bytes
SHA-256: 2114e684f3f4a34c62379f31a5f53d68fc7d55a54b2d07bf95745eeddccafcbb