Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c28cd1a454589e…

MALICIOUS

PDF

97.4 KB Created: 2021-07-02 21:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f5796edef389c1d1fa563584a23e26c SHA-1: f3b55f816c20c8b87153d4a9e217725390c4cd7e SHA-256: c6c28cd1a454589e5cf5af764060911de681026132018794368b2187809c4923
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1df60e27d86f3579524172409a212a1f/rameguvusejipukubadawo.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/eebb157d29622a6894c42b3dad55474d/zoleraxetajidajedokas.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd9f0dd6e---73968459137.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052218093973499.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a08e565c---40798604247.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/66695635d64057a68ad9d57893485ef7/68059459201.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/96288207159.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe6a0c16c---rufusevifadovegejobuvo.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/kunitoromi.pdfIn PDF document text
    • http://aimic.com/userfiles/file/72438544236.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/92123343463.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/her5mg2codbf20gnug4503r74t/nivuwipomaguzel.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/21028193022.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b16727221---jiwugagil.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/16433913244.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/15cc58b39bc84bb60352cde9c7a658d0/97995990726.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1bfb6e586db2962a4152480fe3271fd5/39464615078.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1v2ohvbfr27cu34uqgophhf87b/pezejededunov.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f5fb8983e21a55f370a152b82123e021/90367464344.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/wajawezakavubigagana.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/66128990479.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/24054187436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=scariest+ghost+in+the+worldPDF 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_off00011930.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 16792 bytes
font_01_sfnt_off00013142.bin
e67b0dc9bee2b6e136c9b28f474dcd54a2c376fdcc4a6ace4b5c22e653ac631d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13142 18276 bytes
font_02_sfnt_off00015fe5.bin
a0b46885b1b53d93a540aca3ec15a0fe58ca516b3fdff235da55c22f0ecf418a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE5 10808 bytes

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