Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b89d7fe7ea1639…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 19:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 327c8c353cba26d7a3c61670104c612b SHA-1: 6cf09c494207a5f0724baa910af517d9a2ce3282 SHA-256: 53b89d7fe7ea16392b0bc93c4033d4ba47d3079c29bfb1286a2e42285d962feb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://nomylo.ru/uplcv?utm_term=windows+programme+auf+android PDF link annotation
    • https://megatekspb.ru/sites/default/files/uploads/wejoruputu.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/zonaduworakomewuteli.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210914074534482996.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/38407238529.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/30812907669.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/pusoxadezawomi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135abc9394e5---dewebof.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/waraxetomojapu.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/jinikaluvivixuvoti.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/zuwedanimirijakoxelevi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/16472a108c23130939217c1ef4e6b221/vojijekepetute.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/42329667880.pdfIn PDF document text
    • https://pixel.bg/img/file/69735040409.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/46621364911.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/supin.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/togipomuzezapifutawawulax.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/zafukubilev.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372381cf41d---34877960282.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/vewabitijadowanaveze.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/kagajewajo.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/mumafejalogi.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/motizot.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/16ebc1885e81281a3b98484f0c31cc39/91171656146.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/jizigosugo.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/5101241707.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/temabegefizafurimupap.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_off0000e995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE995 10876 bytes
SHA-256: 36d3687251272de471175a1cf34759d8b6f3cbec24b6ffd5b16245e8f39ed10b
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 18980 bytes
SHA-256: 2707891bb6b3aa7af35638492538d8367179b4bc9a9a7661219e1b6206f2616f
font_02_sfnt_off0001320c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1