Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d13a98aada536f2…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 02:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c45d755418976a91f8e9a6c4ac447761 SHA-1: 01486740013c73ee9e9df6fd4a8a18fec330b64a SHA-256: 7d13a98aada536f2e6aef6fd91335a5f8b2ad97f43e046d45d1ecdc0af040996
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns align with techniques used to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://stacjaregeneracja.pl/userfiles/file/rivukadopobugujusitoz.pdf In PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/20065057909.pdfIn PDF document text
    • https://clickbox.ro/images/file/19468855676.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8ae323d5143157679b1ce14eb78f351b/17907235337.pdfIn PDF document text
    • https://angkalaris.com/contents/files/24696471558.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d50ccf1416---xekujurav.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/xofovufajoxerorulatovofu.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/33694783670.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/zefalovadeg.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb3927f74---65232501338.pdfIn PDF document text
    • https://network-italia.it/file/siloviponugexef.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/pimotuvevijadewidi.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/gominesixufuxerexewitowol.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c9820f4f---1331586305.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/60096005082.pdfIn PDF document text
    • http://machulski.com/public/file/88181669886.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/fasawemuzawuvomudaki.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/timulepafunuzedakazofu.pdfIn PDF document text
    • https://mkontroll.hu/File/pawizatexovatetar.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/rurojesofazobumuvejuged.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090905095456.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd7d469f4747ea6edd14b564b15c48a7/54900434201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+stop+group+text+androidPDF 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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 10800 bytes
SHA-256: e717f40a34e2ad5e9df96b47f489a3a615b391575a6d3d14d41c90d93d4fd242
font_01_sfnt_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 16860 bytes
SHA-256: 0fa2eff161f79599523487335c28d0303aecb70b52d443d902485501df983a1f
font_02_sfnt_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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