Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30ffeced4c37ff7…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 09:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8744b222e107a07830d9caeef3cf3298 SHA-1: c04dfc7b785fbf2a729bd98c20b04b9de1359b82 SHA-256: b30ffeced4c37ff733c72ef42bac71851646ccfb7699b0e71ba405987bf7604e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/xebenelekum.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612380c8266b0---mojonavuwizo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a3401cbe71---34959082570.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d7112ab5a---55494147644.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3b0d478d---97262949603.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/93223820166.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/44da0c5f77ce66f1dfe96b061a41b25d/20074432479.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/64201911372.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b08798179be---25408774008.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4gb3dkjdg22t4j5rev1t1uq7eg/75954228373.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c772aede45---vifesixejifakewuruda.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/69473350599.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d608e9cb3b08629e376e4cb0ef8ad403/18850115027.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/muvogapivitepojada.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/18030841949.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8au836sgl2nkcgqne082nafh73/lodukupipij.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/nuloreladiparot.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/85181484534.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f477182d2dd4ed0be2f2229b6370c60d/rebot.pdfIn PDF document text
    • https://agatanorek.com/files/file/95053589322.pdfIn PDF document text
    • https://hagepoorter.be/files/files/wisutetaruroreb.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b02l07n9933pig3pno7l6obnqt/riminagaxomolemejukokil.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/gizot.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/48544193329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+information+systems+for+health+information+technology+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/mezugizabikomasejiloru.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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 11232 bytes
SHA-256: 6a23acd5ca40f743a3201a055723e1699a5d3c144e8c5ac1754c3947e2a5f6f4
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 18664 bytes
SHA-256: bc070499b5e6fb3c1027236e55082d5f203801f087ecfa84b703380af6e8cb4a