Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c900f5c8fb067fb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 06:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0de49ea5bbd96c62e2a7afe472de9f0c SHA-1: 0a4eff977105d790285e522a55d15ffc9ef0ac86 SHA-256: 5c900f5c8fb067fb5bab9a779b3f326f8ddd04dbdeb7e4db604cd5dd45c6f4d2
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3022ab9cb---zexufazisipoko.pdf In PDF document text
    • http://evevoyance.fr/adh/.-/file/60374563236.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/4376241175.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/bulun.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pba9ql8k7jacu3gp9pqc7h17so/mulenakifonimafubod.pdfIn PDF document text
    • http://ducnhua.com/upload/files/18211448196.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/73052416224.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/42155101371.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ju5b5jt2g2pvfgnevlobnlgh6/niwunubijapipuba.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/75862068471.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1b0c774fe7f35a67200d85757586104a/zoziwafa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f714ca4587---kewewuv.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/24801381060.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab271d9ae3c---volosezubogo.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/jidapuxikusebetelefoxonaj.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/4041474451.pdfIn PDF document text
    • http://myredm.ru/uploads/file/27966291185.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/86196683693.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/vajewod.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/83649247103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+craft+furnace+terrariaPDF 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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 10292 bytes
SHA-256: bc7b2ce21b487d44c3abcc13b35c4e202a641e8a63e57a56cf9c6d2d0f8c5da1
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 17328 bytes
SHA-256: 20f1f2a8e6b4cf15201d6e3ef658bb4969d1305c0ad408af003bf828c91dd3f4