Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30e9803568fae21…

MALICIOUS

PDF

84.6 KB Created: 2021-09-14 09:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89f386f9eb5b1177bb65b04f5ee8efdb SHA-1: 27e34330c26fd2545e54517b75f1d37481ad9f82 SHA-256: c30e9803568fae21459dfdc51ec81882b4c8cf17a02ad0134d6bee5df754f901
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is used for phishing or to distribute further malware. No scripts were extracted, and the document body was unreadable, but the URL structure strongly implies malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://sanipacific.com/attachment/file/difoluveromosiw.pdf In PDF document text
    • http://thietbiantoanttk.com/uploads/files/66901337590.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/83865094064.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/juzufoxipusizamoni.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/212a15e1f110d62e548ee7f6205da62a/xenogin.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/dedigixufadamosokisibav.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/74970480788.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/75285522284.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210910082727.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135774f0014a---vonove.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/64638874738.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/99997950193.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/jezivejewejisoru.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/jujaluj.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/29715133824.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/8744866687.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jaaukpedbh2tvlr1fvk8j3latj/rofobe.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/1506217627.pdfIn PDF document text
    • http://htygroup.com/upload/files/dozuzimudugu.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/23592975086.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/xafexawa.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/79589074920.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/75685657881.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/54167361478.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613262f1a0a2b---93457053707.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109121245511224.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/13444445164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=s9+camera+pro+apkPDF 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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 21684 bytes
SHA-256: bcdcf24e09c2d39cb27d587d3bda1a2d84a51dda4be28454c98dc8131198a958
font_01_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 10364 bytes
SHA-256: f931a8517760e0021e03d23b885a3ffcb4d2011b0ce72057f910f47169e89f63
font_02_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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