Malicious PDF — malware analysis report

Static analysis result for SHA-256 624e32ae933e3322…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 17:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c20035590dc7b260f22282e332f805d SHA-1: 7120528b055fffed880cf36b66c389741f9e7af6 SHA-256: 624e32ae933e3322894c3b9ebd9d31a288b230026f25306b24b80cfd50ae91b6
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external links, some pointing to compromised CMS uploads and others to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smwebtechnology.com/arishayurveda.com/userfiles/file/15473355473.pdf In PDF document text
    • http://hueide.com/upload/files/3539654313.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/83681080394.pdfIn PDF document text
    • http://yjccnc.com/upload/files/zeketetipu.pdfIn PDF document text
    • https://gangnampools.com/contents/files/77748866914.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/47184938525.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/sapifeselalibed.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/63578187893.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/70fe06740ad6115e626e304393f9667c/91606151812.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/95902799047.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161380da66f82a---natuti.pdfIn PDF document text
    • http://jawarakreasi.com/file/semujutudetubaxose.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/zabipufapozum.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/71910901295.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210908142713376.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/vutosovalonabokugedenalas.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136997006422---71891003924.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210901163053722320.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ferekeka.pdfIn PDF document text
    • http://jadeite.ru/images/file/38923083618.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/peruxofudox.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/49411816945.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/3159922860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=windows+8+pro+product+keyPDF 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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 17780 bytes
SHA-256: fde7fa407801948155c39803dbfe2307b081bb37b2257f60fe0847bb497e8ae7
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 10892 bytes
SHA-256: 5f7c5b9dbf08e44f4db506ec31f5a7bc4a9fb6664e1c5adc0bbea280446153c4
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1