Malicious PDF — malware analysis report

Static analysis result for SHA-256 4def5f2a55f05147…

MALICIOUS

PDF

89.9 KB Created: 2021-06-25 20:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: eab2877434150d34ec0ef4cb394534f3 SHA-1: f585d1d87746c60db5aa119e5aef7a03b96b3432 SHA-256: 4def5f2a55f05147e937134e7e00ace21ce2155be5b792a7863dc9c2581c3c5a
156 Risk Score

Malware Insights

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

The sample is a PDF document that leverages multiple heuristics indicating it is a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document's structure and embedded URLs point towards an attempt to exploit user trust via a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160988828883b6---vududopisoxavenam.pdf In PDF document text
    • http://jngf.cn/files/file/pagifizulu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d6b1f09e---24901362557.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/pu7tf22ibg7nsem7ff9pcbh74t/29813457130.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5ukuc6eml5je4vranp20lijm63/vijibofasudifovib.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b355747d00a---lurijujubajulukajolirego.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af3508bd1b5---patutukotozezexub.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb03e5fa2---14493931704.pdfIn PDF document text
    • http://getem.pl/files/file/medop.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/sezopukilewinosi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f24033708---bumemojukamegenaj.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/wotaroxidi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9a9c7ef7---23606825612.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38efb9dfb8---79766833592.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833c2bc086---wajubovibibafunug.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/58254205345.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b90141b9984---47443942754.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/42875156244.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414b61c021---2121723020.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ddc090020d761f18574d79d838fb7bcd/mokeduvoju.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/65796703631.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/2890434095.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f31529e623---72985986161.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/19b265834bb8c723a3b95dabb5e7183c/sidowezize.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160966bd390a3f---89904654218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=personal+objective+statement+examplesPDF 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_off0000fcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAC 16912 bytes
SHA-256: b6605ae67397e0970a5572992858167591915962383a70e7eb4b03cdb8bd3de0
font_01_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 10972 bytes
SHA-256: 465cacfec48882849a3757f122b96f4cb2d5e30c79a22f53b28bb5cead91e37f
font_02_sfnt_off00014217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1