Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9d01b8ed11350a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 11:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad0df3c52e025e250c1d0a932efc83e5 SHA-1: 21c6a1e68141bc4d1e63631a1cfd6f077d5d1eb1 SHA-256: 8e9d01b8ed11350a73f7f8cc1a5524b41613d52a6c03e201eccb4a117f656864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=credit+card+numbers+for+age+verification PDF link annotation
    • https://myparrotfood.com/user_files/files/sexinuruputix.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/77809043087.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9a6773583a3b6c17c8e4929cee68db46/70409829416.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132047b84ba6---wesutolivina.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/26606710395.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/24556485661.pdfIn PDF document text
    • https://vpmemorial.net/images/file/dalinesovu.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/17484724146.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/57891614996.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/nelapiditosopisuxabetet.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/11179327897.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021912544167756.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/zejinevagitugaromek.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/535726ba0013500396d334ab5d0b8b01/43703959973.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/labavaketaputamot.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091017142857.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/99153866280.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/tebokasizukipiwodo.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/kipotavamuxalonivenato.pdfIn PDF document text
    • http://iucecb.com/files/file/gakonipoxurepojatanolume.pdfIn PDF document text
    • http://synowka.pl/galeria/file/27734479360.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/dajejotubufo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613154ddd00cb---49308832509.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/80867256402.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_033113.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_off0000bfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 17440 bytes
SHA-256: 7905d60b764a56b5794bbdbaf108a0687721414dc7180c939174608b3488a909
font_01_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 11108 bytes
SHA-256: 8692e61bdc50b56c7f073f7d96543e5f111e9a66ea0e4c127444e267919dda27
font_02_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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