Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef93c83acf3325f…

MALICIOUS

PDF

85.4 KB Created: 2021-10-10 06:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d8d444a4d1bb9e3b9c5a5951eb57b16 SHA-1: 8037277c50c495eb1a6db8ce068aaf0aa2b41f9a SHA-256: cef93c83acf3325feef2ed76994c81f04a8e0a114e52eca60276529d1e506c08
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a 'LOLBin token sequence' heuristic firing, referencing a URL that includes a PDF file, further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://grafiport.com/userfiles/file/xotizarupogutatazusidage.pdf In PDF document text
    • https://momentous-inst.com/uploads/image/files/81751398765.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c08018937a01d85c55a262d76f928fd7/gogewajosiwesetusorin.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/sufadazubo.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/nanikabedusuxewupibop.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/24957061690.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/33838198437.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/kilamozamopak.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/pudiwenabelap.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1615610f539367---65843311741.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/didesanajovosovuxegerizor.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/fusejonifezeziju.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210929065011.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/29895635885.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/kenixasixikuf.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/73311324405.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/17932734534.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/bd4d368a7f5a73cc18c403fb9adc43a4/zabidotubezu.pdfIn macro / runtime command snippet
    • https://firsatpin.com/calisma2/files/uploads/pajumawijelov.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161311f267f001---wigalut.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/sunubumagufe.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/xigirifudom.pdfIn PDF document text
    • https://polytex.de/sites/default/files/44767088654.pdfIn PDF document text
    • http://xinshifm.com/useIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=be+obsessed+or+be+average+book+pdfPDF 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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 18800 bytes
SHA-256: 31455ac18842140cc0b4b75409bf5f1ba172ed62a62b87a0893eb270bf30af8b
font_02_sfnt_off00012f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F74 10684 bytes
SHA-256: 31f203415c622af4a6a2ca7b318b1a325e7f01a7b0efd936c83926804f22827c

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