Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca19f37a332a28d5…

MALICIOUS

PDF

69.3 KB Created: 2021-09-23 13:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 629b512e2ec4f24215a1de49238e7f04 SHA-1: 90d062fa6a7cbd9f3f3b64be4e269eb8befbe13e SHA-256: ca19f37a332a28d533a367bbf91a76ba7ab759af6d425c1ac003b2a1ab504bd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and numerous outbound links align with spearphishing attachments used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=naruto+shippuden+404 PDF link annotation
    • https://www.opsclown.it/ckfinder/userfiles/files/dipitusabivixejebewor.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/latuba.pdfIn PDF document text
    • http://etnorom.hu/pictures/dugadowevuzun.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/95097243585.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/sagofativujuxovibitolet.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/giwoteri.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/29331443941.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/ramuwozomewofibemuwuror.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/pozupopaxilazurokibelepo.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/33919767506.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/24f0ce6be534f7b4560899762f344008/ridomipinapul.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/relepevobaxibiwejuwep.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/gesimo.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/tuzibuwajazuxi.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae01b8aec6---49858383261.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/sosudo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614736230ce95---91106790186.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7904a17---53048853905.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16134a5c66171f---37737889907.pdfIn PDF document text
    • https://reha.bg/content/upload/file/wapajajuzupemebogeleso.pdfIn PDF document text
    • http://e-sheremet.com/img/90118024145.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/kikeg.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_off0000b0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 10720 bytes
SHA-256: bee52848494421c6cd40cf8f38fa3bf776e493ffafe20522509bafe2ed1da1cb
font_01_sfnt_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 15224 bytes
SHA-256: a935b24a0a3fe88326f6b97c3d1f7f095d23f907f4c9e4e11566a972e2791930