Malicious PDF — malware analysis report

Static analysis result for SHA-256 d634a20908887bfe…

MALICIOUS

PDF

95.3 KB Created: 2021-09-16 04:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd41dc8f95602b8cdfcd2e78c6db5722 SHA-1: 7f31a41ca2d460509d22387bfe2bae1476ab50c1 SHA-256: d634a20908887bfeb1b358f5de5c81f7cefcd4fd0046d92a648d37d52a33033f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs and is identified as a link farm hosted on potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=new+movie+app+name PDF link annotation
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/sqm5ab3hn7nm4f07splsfu5se6/27573789312.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/lufujonuvadobe.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b672966429---xavigurelezumep.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/30242871147.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/kukubog.pdfIn PDF document text
    • https://grouptm2.com/contents/files/dolada.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/42477979232.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/33172579296.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/pupemetux.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/gegenedizew.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/42574418748.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vhh9rkac8almbc3or7dr0jnbk0/sejeguvuvaxufobap.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/13324062175.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/zinawuzubi.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/melarajonalirapewi.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/moromametikubeg.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/93540604152.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/36334500665.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210903_141015.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109140230498192.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210908205948.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/fagonurubiso.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/lutifadujato.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e65626a1ee5dde0585e8fde3084f5e01/56460175386.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_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 10132 bytes
SHA-256: d39d8a6e10c21273d858bec405b174b3f726f3e5e394a673f2e75105d1740f25
font_02_sfnt_off00014083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14083 18224 bytes
SHA-256: 3e9dd20e1b474880ec8be5e3ffa2398f726b59ee11ebf22e8e4e03428e0a989c

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