Malicious PDF — malware analysis report

Static analysis result for SHA-256 acea15ef961e1d31…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 11:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42c3ed60e20c76e540f8740abc22de91 SHA-1: 471091402e50f951675cb7f9f8ac1dc15a7df4c3 SHA-256: acea15ef961e1d31be1c4f9490df73c2d9f851af27a1b5d8337ee7f8ae3a8d35
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://semagro-msw.ru/pics/images/file/vaxonalusekediserijavejo.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/54798939ccc1fe5324793b35efefae5d/69652652744.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/zesakemusixubexugap.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/bezodidazafugopave.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/76418258760cc533991153.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/23882865680.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/46434839836.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584dd2f7ea---45475553619.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/dewot.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/62866063661.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a77487baaf0a3f9d69f5edce1177b0a7/mokujebirorageruse.pdfIn PDF document text
    • http://ladna.pl/user_images/file/raxusu.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/73913824583.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6e1378c5---50938250344.pdfIn PDF document text
    • https://angkagenap.com/contents//files/57008048075.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/sevixeradetalodifoz.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/rujubepamowolaxe.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa294028f7---33048848856.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/90662893189.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/g2mnej2d0j1pq7f7jh9g2t3mqr/sepinotomibofedajod.pdfIn PDF document text
    • https://sinarwaja.com/account/files/gufujefatusi.pdfIn PDF document text
    • https://33mobility.net/uploads/files/34790574763.pdfIn PDF document text
    • http://serting.eu/userfiles/files/98731389607.pdfIn PDF document text
    • https://protrialse.eu/files/files/20066957004.pdfIn PDF document text
    • https://campermagazine.tv/public/file/31867360.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d19b8c7---wujamisufuluxopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=6th+grade+math+book+mcgraw+hill+pdfPDF 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_off0000bcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 11184 bytes
SHA-256: 10fff7a14c3b8f253dcbd0e0cdce0ac24df5a24e67e8526e27dd59f11441bf58
font_02_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 15280 bytes
SHA-256: 0463c24f863ccedf3c5289a657d7e1f574ad23d19c69dc6c4ac98cc5ac4e3830