Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d13d7777bcb9b5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 03:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13cbf78ef57d96138937bcf53981e8eb SHA-1: 7f88a06bd54633f86be20a3a2e41eba877f64faf SHA-256: 95d13d7777bcb9b52697f12e85f7b1e68e35fd1d2a7fc1750a9d9df4b63c898d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to appear legitimate but hosted on untrusted infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://natinsel.com/imagenes/file/83447003676.pdf In PDF document text
    • https://zlato-invest.cz/upload/files/86960614556.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/zawuxuxot.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/1431607135.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210919_DC49032060096743.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/xufivuvubinek.pdfIn PDF document text
    • http://toonesk.com/upload/12725332923.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/xixifenijo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vudamas.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/74557147837.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8d8q9ivbu52cn7temudckmgkcb/82828071918.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1a488cac---34710973558.pdfIn PDF document text
    • http://domuran.pl/files/file/80991804193.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/83260314020.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/bigon.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/84858400559.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/15370dfaf85d8301c443f03ee3f6775e/20599508370.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202191221550877.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/wixexuroxureja.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/46197240.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/55565890168.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/diraso.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/89382558803.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/38011651069.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/dagomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=our+love+story+full+movie+eng+subPDF 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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 10840 bytes
SHA-256: 8611017f9672377dd400e4ea3781415cb93d6427de7f6db5b3cf9fd4da0ab376
font_02_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 16476 bytes
SHA-256: 3ad735c3985ff856a2e88e99a408759a1224b38b6a5145d89676a4162bf74721

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