Malicious PDF — malware analysis report

Static analysis result for SHA-256 24496366e5468a02…

MALICIOUS

PDF

75.6 KB Created: 2021-09-05 03:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16d3bccc4be866237cc9c8ec307c8b4e SHA-1: e240458b539291ffa0633cb1c75cb7d3edc0989d SHA-256: 24496366e5468a025218f9bc5ee5d510bdc8a0e0785d77b21ee56d6e3be613a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further confirms the malicious intent of distributing links.

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://wastran.ru/uplcv?utm_term=axis+and+allies+global+1940+rules+pdf PDF link annotation
    • https://alternatifhirdavat.com/upload/ckfinder/files/56524788320.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf05c829ea---barexofarovojijo.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/vitaxivivuxonijugo.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/8099611178.pdfIn PDF document text
    • http://ty-int.com/files/files/40588417893.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/wunofoluloxafesabedamum.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/kuvaruvup.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/61005281815.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fda7996f26150401507bdd43ef8f17ae/zilozakimidipilewoku.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/gitofifofagikujuvitukusax.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db50968bb2e---60124602375.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7a1e9867---76837927883.pdfIn PDF document text
    • http://wohingltd.com/userfiles/zadapovujaxafepanutede.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/mokapofibitisu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/88201540721.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa48f1ca6---22811469868.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6fa70169f0226e36c457f45d28d20fd/mowolirepalowagijipukawu.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/vonarajuponinirat.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c99d2d0d30d8312db6f2c514846a1776/20746430966.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/xakalotebisetoniv.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d9c179e02a0d89a4a8b2ff69e920e1dc/69787984547.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/tugefesifokovove.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/maluvamepikobubixi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/womowemuximerowibusozi.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/65671678572.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_off0000c0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C9 17552 bytes
SHA-256: b758a5c2901e1636bb7940fdebbcb791e414b0c885c2e9c9e2fb76572795261b
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 11320 bytes
SHA-256: 868ae1d5ec8da5034fc45609b05844d5000f3a43cc642234d98d245430d5e04e