Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d74bbed1b863ac…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 06:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2288426dcd808dee82af464ae793454 SHA-1: 3cc22383b23f97c2e70e7ed61eccb857ed8e0de6 SHA-256: c3d74bbed1b863ac736aa587243df7fc5a3f35c292f6835a8848781e621da789
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The presence of 'invoice' or 'payment' language suggests a phishing lure, likely intended to trick users into downloading a secondary payload from one of the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1f5503b2cf4cd405e2eeffd30a2eabf5/pujuwepazuxovetiwabukem.pdf In PDF document text
    • https://searchlink.org/userfiles/file/fapepajunibigowigizadiwad.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/foretojonobilezuru.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/rasidazukumubowe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3m4aq55f06jdebilrhbe3cf235/najipatogumeto.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/92976435327.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/554664e609c84919bcc9f7431a0573a8/41953875499.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/60669699235.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/37013217086.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/sudigi.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/tiluxulafafojugiladomika.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4b310b7ebb5ef4abbca1cba88c9f3f74/kekowokalofamixutakime.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/pujedefolunixore.pdfIn PDF document text
    • http://hangquangauto.com/files/98932488791.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/28475606903.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2bde5f3bf3bd298c5fa4697dd84f07fd/53082468649.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/21843943132.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/wopidisabisuvomojodegak.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/velujaxom.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/moposi.pdfIn PDF document text
    • http://gibisch.com/files/files/4247661879.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b400f34b405e2d6676dc3d83c86d6bcd/90959546062.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/f530e79df11609125614b205cb4e2880/vakinagor.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b1eaa6f70---65246258574.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/jabavulidoxamesezejod.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/kekuvujedamun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=car+deed+of+sale+form+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_off0000c697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC697 16364 bytes
SHA-256: a684459c646b060519997fbac885120c31dff651a4b47b460970d44ae2570ac5
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10396 bytes
SHA-256: 3afd1fc741b10eca57506c4fa8a957c24a0906b1113dc05e62e9ab4f12b34a3d
font_02_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1