Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f45053ae280cbc…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 06:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 365a0ba6d7e9f4a9e607ade5c1d99086 SHA-1: 3877da576b130e31f425935d830c0a27fd371c48 SHA-256: a0f45053ae280cbc3d137ad0c2970f0b40d090bd34dcc86b5490337f52baa228
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=ontario+lease+agreement+2019+pdf PDF link annotation
    • http://cancercareresearch.com/userfiles/file/49098421721.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e3cd29881---kemofofudu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7008af04---48403442872.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/goper.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608073945ccee---lokorixus.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/lapokabonevinakufeb.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/32863765843.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/bfe4479398070167143ea54faa8794e6/81915440825.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0rfgfe4g9iaeava4riv361pqav/24219089222.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/7blgpegc07bfg3sagjpqpveov5/50759571066.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/nugirinivatepixora.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/sidowakapazajadowitawewog.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/nanixarinigifi.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/fadopupajumar.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/6973350941.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/posuroril.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/dfd85652eb4f33cf4276b24c44b4d51a/89172623825.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/gomizeniwojazizopogibi.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/41300102999.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/bexamatuwefarilo.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/22832344443.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/76536973110.pdfIn PDF document text
    • 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_off0000b5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 14496 bytes
SHA-256: d7e060d386c47a26624a8d12e8c5a05aa51a4bd4c3c7cc409e5de6611f7fee1a
font_02_sfnt_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 11328 bytes
SHA-256: 40b1ec0235b81fbb648725fcf66f58d853dee00f1d29a6e5957ea083adedd842

Open this report in the interactive analyzer, or submit your own file for analysis.