Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e0929730793056…

MALICIOUS

PDF

89.6 KB Created: 2021-07-18 17:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d27b6b870dd550204c3804bb6d2d191 SHA-1: 862a9778b4d12c67ba6e3e955af3c55006d97a76 SHA-256: c4e0929730793056e33dfdf64137844f39fde66b4f209d8374d0cd7cafcce254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on potentially compromised websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious SEO or to redirect users to further malicious content. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://stphilomenaonline.org/userfiles/file/xaxilagovovaj.pdf In PDF document text
    • http://afghansolar.com/userfiles/file/4196650408.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f761d7a46efe54c3624943a9790e6d33/woxexusolor.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/32a6428b67c97305314dedf4c56bbf88/titudaziputejus.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9c6777867---kupemekos.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79191054502.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/lezulelup.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/46ff660f6a288e0b5e32755c2054a144/sodopobamexeradaxosi.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/4324897085.pdfIn PDF document text
    • http://nature-revive.org/files/file/fonabevevukejat.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/55954458504.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/608777269.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d0220b3b---61760029298.pdfIn PDF document text
    • https://menu2uplus.com/images/file/xuwujagalomovuvexa.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/62378029680.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/37c3fbcb05938536f52010dfb7c480cc/67197105900.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/kitisoxij.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d9be2d51d53134e2b331b1c3b95a8a81/jazolerobisa.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/99636926109.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0e86f0e5---sowogavusiliwaven.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/1ml8pta5ghfjnogvcg69jcgt1n/faxakuxefogeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=top+rated+online+casino+real+moneyPDF 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_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 17388 bytes
SHA-256: f1bcb4593a90ab170b1b5d0f669967d3bd568d8c35a6f09d80415401e4691731
font_02_sfnt_off00013edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDF 10752 bytes
SHA-256: 39f01d3c7d8781ab010a0cdbe9abc61b393ea5d28a7fcfe7df81a382caf8027c

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