Malicious PDF — malware analysis report

Static analysis result for SHA-256 1644fe6973bad9ac…

MALICIOUS

PDF

91.9 KB Created: 2021-07-03 08:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18355919d47cd46d633ade273d35f751 SHA-1: b35e143bd02a9ca4322289fc7954e5f5ea6d5a5f SHA-256: 1644fe6973bad9ac1652ef350a3cdae1c24b1958eab8afadc67b5a7f8b05dd85
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://trans-serwis.com/userfiles/file/73254670001.pdf In PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/xofegogagixeviposewefetaw.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b9cf3268---vokus.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/47840459050.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b284c0734---80174040634.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/vuvuwesosadapakujigene.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d7eb5a5925e---jonoxe.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/tomakuluwefukixofilose.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088febd0ef19---pakokuwubiwikomixasosuzow.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/8cfe713d3929d968b9e3c19da998c911/fiwujajalaze.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607955219041f---kikugawamujitoruxuk.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/19470909304.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d59db4a0b---mezugowavar.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c2f17297b3dd72427fb0e44ca7edab2/31078463529.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6228021f2c39b8c651e32561ee72aa89/66489563208.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/6437323882.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c54072d43c---luzure.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4230f411f---detekalinadutaletu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0759d8ce1fcba43890883dcf101f568b/jafijisedigupowivi.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/91403006338.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/winepaga.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kebupuvisuravimoxep.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735715c778a---wubasovogifuxumagezawu.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/tijoso.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c397b1653d1---jeradukefobolupalawela.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/xuranekomilitimujupepage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=bible+verse+for+love+and+unityPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 17148 bytes
SHA-256: ee4dd14c84da4e4f6bda61c372a72e36c6681c49ca638e53109d691f6bc64a54
font_01_sfnt_off000130e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E5 10820 bytes
SHA-256: 7b443c36f877cf925a38321dd20edf89873c0172594b6f15203b222b4fef2a97
font_02_sfnt_off00014a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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