Malicious PDF — malware analysis report

Static analysis result for SHA-256 c119fb25617bd76c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 13:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ddff6ce516129e02b2c69235d0c0862 SHA-1: 83896a8fb3bc810dfe632b68487f97b59ec0761a SHA-256: c119fb25617bd76c28b0180290ee9d6177df20ca51f9ff58bf9191c20264da2b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and UTM parameters, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, but the presence of numerous external links points to an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5l19274bqe0o1d37vieab8fel5/87145039935.pdf In PDF document text
    • https://zoorichi.com/temp/fckeditor/file/34503440953.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/id532jkc9io29aqoj083kgh722/fuvofekimiwiv.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/besegutub.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/porovazoleruruzogade.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/40108181988.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/95254620137.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/24026cf76f73ef024e1c8731999928ab/90324039334.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/30164454564.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbfde4ff0---zodadarula.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/18664079300.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/wejimozisuvozesedu.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/6963343689.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/fuzisarujuve.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/20855465c98a95708da8babf4bfa81ed/wodibazafanulu.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/21893308020.pdfIn PDF document text
    • https://greffedecheveux.center/upload/ckfinder/files/xofufadafukiwubejajarak.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1c20c5b5d952a84c644750c815e33b43/dirujupetepozaj.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7c16599c2---wabenojagepojupaverajabuv.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081666e7c983---39540266911.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1eacc383---xezezatugokusaxodidoreke.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b995e2d0d80---dawumilugidid.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/gamide.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/zevalunewanoxikafeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=williams+obstetrics+question+book+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_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 11252 bytes
SHA-256: b1f56d39e7ce5b78e9ce5186b69c7488044788c881f1a026e1a6c190a948f004
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 18480 bytes
SHA-256: bc617007cd84fa8501ed8e3ee2842b4c15ad7b786bbd2c4c060b981073129fee
font_02_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1