Malicious PDF — malware analysis report

Static analysis result for SHA-256 2217831ff28af5a4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-01 02:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d216c51c6df3df2b5c5330160774481a SHA-1: 8177b72b5b6581fc9b492bd16aeda09c6dcf1f2c SHA-256: 2217831ff28af5a4901ca6c8340cd2bbced0333d7fd689ed6c75cd5c46660116
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into clicking these links, likely for financial fraud or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/dcc37577b9ade4349e7201c310dc2b52/13999985069.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9b36bc36f6dc451b4e35d54c6af6f8a6/demajami.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/10209147205.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/48472576644.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a60782dd0---botukebotegefegof.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/nokitojojijakibekelokalu.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/lubevusised.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/88942910387.pdfIn PDF document text
    • http://kbchina.de/upload/ranukeso.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609748c0ee105---siginazukene.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb55dd6d5---85204021370.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/kewejepibiragi.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb2794f1c6---negarizem.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/balodepedutuzitomigolo.pdfIn PDF document text
    • https://limsurdua.com/contents//files/kutigemiresijilevi.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/pabomi.pdfIn PDF document text
    • https://scalper.ir/data/files/file/jepowukenijujarugi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/maijeut9sdbhjf6qtvfaiuauaf/35209036068.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de880852f45---dinakugiduxipexevaja.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/munopumozuzeleruguruviku.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/toxibodakex.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/24912098698.pdfIn PDF document text
    • https://o-dance.com/upload/files/buzabopagobosajik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=letter+of+credit+books+pdfPDF 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_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 16216 bytes
SHA-256: f6f4144463cc7877075d45c7925619bd83720ac891a435930347304bb27e00bf
font_01_sfnt_off000100fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 10488 bytes
SHA-256: 3d02f1523e592e35cda01f7ae9ac5b216c5cb9bb73af866f5f654f802918de16

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