Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdda5312536d6fcb…

MALICIOUS

PDF

93.9 KB Created: 2021-09-05 02:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30ab3a0e7a8c2f05d17e9909907670bc SHA-1: 4d328b5c7c6ce4539e19b55e5becd60bfb59c663 SHA-256: fdda5312536d6fcb878c48cac255fb164ce7e3ecc75f10655371f7a144668f8e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/64633032722.pdf In PDF document text
    • http://amandamaitland.com/images/file/vubani.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5dfd6f86cf1545439b63b17eb85a5029/87350702965.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078b89216dac---47749663942.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/vupez.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/reravotixewumuvo.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609661dec2bca---88203032427.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/778c88357380c28d8538163c81749fab/wubav.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/waloduzenumimonufunep.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/wutitodonusevigivarel.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/fc6b463fdaf63a9844d33570273766bc/29130605307.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/84936119431.pdfIn PDF document text
    • http://ktcz.eu/files/files/69382645026.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/91805365654.pdfIn PDF document text
    • https://lecachet.fr/docs/files/51673516637.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/27861869213.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae6fba5bcf---tulamevoxanaj.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/25721872736.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/3cc9a87b7b9bfb499e656b8f932ef85f/17737599832.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/79034885036.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5bf53ed2d7cc609b2dc54673173a3250/fubumidebetoruwawixukibo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2889ae40a---83759016065.pdfIn PDF document text
    • https://citytrafik.nu/images/file/50480798991.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/54071529999.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/70983166594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=classification+of+seed+plants+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_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 10544 bytes
SHA-256: 4f85300858d25d81ca8cedbb3ff0f827b0a199d652e91ec21e457a4016a3aa12
font_01_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 18688 bytes
SHA-256: 2810256827f220cfe4446900690eb25e9f6f4e39d36f0e8464fb377502a49369