Malicious PDF — malware analysis report

Static analysis result for SHA-256 511e05e9d6ed9bf8…

MALICIOUS

PDF

88.6 KB Created: 2021-10-10 10:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a76f4df1d4076b100ce941723a865729 SHA-1: e946cef2d2777c1c349385a4511b4c387a3ac983 SHA-256: 511e05e9d6ed9bf88c87d0300d83c6477688b08e9bed20e5e54b5aebf5f50ef4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. These URLs are likely used to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=geometry+transformations+composition+worksheet+answers PDF link annotation
    • http://connect-event.fr/ckfinder/userfiles/files/68196560753.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e347880477---15046920120.pdfIn PDF document text
    • https://carlock.hu/ckfinder/userfiles/files/kakadubiwusamefamo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/8519f139cf1748158f13546479fcea5b/tusodikifimudakiregapum.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/72003421335.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/duzuba.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/kolezapoja.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/45074032862.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/ninuga.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/80112136184.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/mugefibivipajomunotim.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3c9c3d54f---70893583805.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/fuwamudaberitaz.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/zegepelidisot.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/zosulotunowobe.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/najaxigizisefomeb.pdfIn PDF document text
    • http://plncse.hu/php_data/file/wajipuruterugober.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/38915273660.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/lobot.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/20053207101.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130816947e4f---75855756746.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/luwufirasubunela.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/30375595912.pdfIn PDF document text
    • https://zhansq.cn/upload/file/17821341001.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_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 21776 bytes
SHA-256: 65f91cdb0abf9c94375d90473bd9267f49cfc522ee5b63b69226b125aa240183
font_01_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 11028 bytes
SHA-256: 6de594c55b69d8550c076f3edbe186cad4665dc10745660be02628bed35a2aeb
font_02_sfnt_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1