Malicious PDF — malware analysis report

Static analysis result for SHA-256 2340fda6a3907f9b…

MALICIOUS

PDF

97.1 KB Created: 2021-09-11 07:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffc04464787edf3d1ec5696f319b579a SHA-1: c93698eb417b58633be8a8be550535a75e9241c8 SHA-256: 2340fda6a3907f9b3e0e4c5c6455f3bfa0b495e372b9dc5ae716bae9bcee36d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a lure to trick users into clicking through to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sysquare.com/UserFiles/files/34145257113.pdf
    • http://sanraimundo.cl/dyn/uploads/file/dopetaluzedunivov.pdf
    • http://hoya-system.com/uploads/files/202109101245114212.pdf
    • http://iact2001.com/userData/board/file/9426485802.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137446701c23---73896893457.pdf
    • http://tksvolga.ru/userfiles/file/redajumok.pdf
    • https://condominiovillage.com/userfiles/file/57871691916.pdf
    • http://aurastaffing.es/upload/file/dosunofobaj.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/54939987951.pdf
    • http://murasakijr.com/uploads/files/gegagalazeresar.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/9991504435.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/73a097c9199976e34b4c606983b8d2ee/19693200921.pdf
    • http://cosmikkino.ru/sadm_files/xebazerabuloj.pdf
    • https://georeno.ca/userfiles/files/85716640872.pdf
    • https://narellesastro.com/userfiles/files/7419987741.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cd88c7439d0e1acab5293ea331bee8f8/bobuzewigigijezolel.pdf
    • http://aarogyamedico.com/userfiles/file/93882692659.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1418603ad---tezewodipovef.pdf
    • https://tanthueviet.vn/img_data/files/fupeduketovunanet.pdf
    • http://www.rify.us/cms-uploads/files/walifosunip.pdf
    • http://hoinhikhoavn.com/img/files/21977694872.pdf
    • http://hoteldanang.vn/uploads/images/files/rowojuxelupuxino.pdf
    • http://jfhconsultancy.nl/userfiles/files/kizasazove.pdf
    • http://red-persimmons.com/upfiles/editor/files/48002747827.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=q+plus+android+tv+box+firmware
    • 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_off00011042.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11042 16792 bytes
font_01_sfnt_off00012854.bin
b6e8148a83168119e7602fabe8d37547c916aedefdc66839573179d794470a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 19852 bytes
font_02_sfnt_off00015ca7.bin
78c7243bb72e0d3ea681600e005956080d5de90c55d3f5f7f8ee7b2dca37f6e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA7 11212 bytes