Malicious PDF — malware analysis report

Static analysis result for SHA-256 893ad1b1e25ca980…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 10:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 038d0d07ce77240d165a5d20c5195bec SHA-1: 3ca9505ce64ef2fcc5e95a52c1615ecf35a00783 SHA-256: 893ad1b1e25ca98065237dee05e4aa529afb27dad9472876b0f0e870169d1369
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDFs hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philabc.ru/uplcv?utm_term=beriberi+results+from+a+deficiency+of PDF link annotation
    • https://duvanco.be/docs/files/givepemanerisedetuxiz.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/wudusewujijisumudegik.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/16748193100.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0db6decf20---nuwosarimojimegupilafu.pdfIn PDF document text
    • http://yuli-china.ru/d/files/60406431952.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/3aab3bc647bb7dcbfd8b86c395e540c2/fowanonuwumirukazodi.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202108281346556684.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xuloketinopud.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/25f8381a163ad24e7616dc1effb3c6f8/fuxuz.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/72718107623.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d5c7141682f7085b80de4260141a6ddc/purom.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/86662680024.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o1ljpm4ab6b8rc4qud3boi5pom/14131235821.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/1543033110.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/lafavafedor.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/11md7egir3v52u6pug30tkr29k/7651451249.pdfIn PDF document text
    • http://skomi.ru/img/files/file/lafokikafa.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r2rujoagqp6iqnjti5o2qju7s6/25981260487.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a13f5f4cc---72832510140.pdfIn PDF document text
    • http://airmon.hu/images/files/vawopumexe.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/sikazekiz.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ravusubizu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/24e86abefdef546a133c8ad8b653aff3/daxifeja.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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 17916 bytes
SHA-256: 2eb9ec5e84dc8cd710ec0f5887b6c320e6a2c9a43a898338bfbcd32688a2cb37
font_01_sfnt_off0001193a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193A 11044 bytes
SHA-256: 27934ec9f04595c4756379eca8287a78537bedb93ebfabf0cb7484e113151b93
font_02_sfnt_off000132ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1