Malicious PDF — malware analysis report

Static analysis result for SHA-256 f517ca0c5fd50280…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 13:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cf740ddc8e8cf53ab1afc38ef3ef4b8 SHA-1: d60356d35bcbac7a254ae75071b8266a41afbc1f SHA-256: f517ca0c5fd50280c55fcbc9cfa82b5803c92eb6cdd65becd073152effdf02a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that form a link farm, directing users to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=torna+a+surriento+spartito+pianoforte+pdf PDF link annotation
    • http://steelfurniturecn.com/d/files/bijajasapevetuvo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d4a4e52602e5451405923296de1da32b/xemevu.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///naroweminumezesibeziki.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/gipokuziduk.pdfIn PDF document text
    • http://adveotec.com/img/file/woxagatumizenejafejedi.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julufumosogukusi.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/29485493986.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/51091166751.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/54311488151.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/warogodoxegeril.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/gawowowireruveb.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/kakijuk.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/6891617841.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3284337a1c---97656762778.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/6345427166.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/jozejezelofozedowire.pdfIn PDF document text
    • https://jurad.eu/files/file/51977024187.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/pogagowutusebadonorezu.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/39617717324.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8mbugn295eq5acudir504bkfnh/fimibefaki.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/26bgdml0lqlrsf9d9pd8c593e0/kusum.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/87303395376.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3efab2e94f---saxujetelezumiru.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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 19012 bytes
SHA-256: 799e734a7a97fe816a7785e4e7edfe3c9046ce32439e3d55994d98a818b34f0b
font_01_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 10508 bytes
SHA-256: 842bf5282cb782c3e68971d333668614796e5f35510ea3d1acb5f7fb74d9d594
font_02_sfnt_off00012185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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