Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca44e8634bc6a260…

MALICIOUS

PDF

120.9 KB Created: 2021-08-08 19:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0e23689e5aaad1748d901efd955b53d SHA-1: 952e8c1d7fc3469fbfb38712d8326c1fda3afb1d SHA-256: ca44e8634bc6a2605f3c013a79371afa502aed000641050a7149d8f6b1a1383b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to direct traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The presence of compromised CMS upload links suggests a tactic to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://argumentua.com/i/file/sazowebokekinixugoromoj.pdf In PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/88634934791.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/23bbfc57cdd62264efd61fdca60c5542/68463853292.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/97196329257.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2241a21f2---23608742271.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/75437806948.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/50281646426.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7rivksdp8254dabq1541ijr6a5/51988305377.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/filasikewunuxoxumesu.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/tones.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b776b3aef84---43198742960.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/54338036337.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/56129543276.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3691e706e12f30a89358cf2ba8089500/wujat.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/kimepidex.pdfIn PDF document text
    • http://minipit.com/data/files/ramoditenugovulizula.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/71d4158f3eaedd1d817291ac3fda1d64/galuxomimunitilotujabas.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100744619c97---fikikilazedujozap.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/vikinabituxinur.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984e244df6c---ritizubapusi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1466a38383---44929764712.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6667qttd39cc1gbcjgjgq868c0/64825383650.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/kemugivodolakezivakedi.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/zakida.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/fisebevozojofe.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/23816193715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=naruto+path+of+ninja+walkthroughPDF 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_off000172eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172EB 18528 bytes
SHA-256: e53dd2d68bbd51f78f27592bf7dd36e53225845ed7a6cf116a6719d7e0246528
font_01_sfnt_off0001a3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBEF 10724 bytes
SHA-256: 54c15a4b0c8fae60ef09c1557fab52c676d36b2c9c19eda8aa2b83d4f7aa1399