Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fcdc306ddfb190…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 19:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34ef43a01c8e2e5824cd388078d1d494 SHA-1: 97e1c51686c20972157e8ad67bc23c32accd9236 SHA-256: a9fcdc306ddfb19039ecad332a0456e49cf3712738a6ed6871062f1e75302f94
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, with UTM parameters suggesting a lure for game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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 https://medvor.ru/uplcv?utm_term=download+game+sword+art+online+integral+factor
    • http://asavn.vn/uploads/userfiles/files/74235169373.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16147b011be92b---tumivaxusorojoxiles.pdf
    • http://hondatayho.vn/images/ckeditor/files/94980698456.pdf
    • http://www.depomatrial.com/file/vopatiwoni.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/72024977868.pdf
    • http://ahzgbh.news-read.com/upload/files/dobesof.pdf
    • http://paraglider24.de/pics/fotos/1/file/kuzega.pdf
    • http://hoigolfbinhthuan.com/users/files/61254049160.pdf
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/1146424765.pdf
    • http://heizler.hu/files/file/xatipidegorofaj.pdf
    • http://www.fdconsult.qa/public/uploads/cms_files/warinebeseperuve.pdf
    • http://silverspringabw.com/uploads/files/81554065686.pdf
    • http://www.tomasjelinek.com/img/pub/file/91065211346.pdf
    • http://inruho.ru/ckfinder/userfiles/files/kepuxizo.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lm203b44m7a5sjj1r89rgte955/47617213199.pdf
    • https://homestayhoian.vn/uploads/image/files/beguwovulup.pdf
    • http://stfurnimart.com/file_media/file_image/file/43523666386.pdf
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poginifamuxijela.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b06260eab---nifovofodivununevulavuse.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/44575755898.pdf
    • http://dd-eng.com/files/files/80787569936.pdf
    • http://www.rannatennis.ee/data/upfiles/files/dinuradejunotaxilenif.pdf
    • http://behtarinekhodetbash.com/files/files/48047760344.pdf
    • https://osiindia.org/ckfinder/userfiles/files/28165288849.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd43.bin
0af2a474e9f85ea20125f76ca6fec9c1fb7f2b8427a0fd81e4e0f4645f6ac9cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 17516 bytes
font_01_sfnt_off00010b04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 16792 bytes
font_02_sfnt_off0001231b.bin
4734153f74333183c241f9856b30a90b2354c7761e8c9240521ac287bd479ddb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 10908 bytes