Malicious PDF — malware analysis report

Static analysis result for SHA-256 d673929ebcb4d762…

MALICIOUS

PDF

84.1 KB Created: 2021-07-14 05:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18acf28f9296701ef208ccc7dda460ad SHA-1: 2521114339d55f20baff23d37b95b3305ef1ddd4 SHA-256: d673929ebcb4d7625b00f00b0b614fc0bedb87ee418db2408dc7e12ed30fa6ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090913dbb295---77927061938.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c5967b30---91241438402.pdf
    • https://advance-pack.com/editor_upload/file/bagepuwumewesovudesaj.pdf
    • http://salukool.ee/upload/userfiles/file/munupomokudekiruwebebupo.pdf
    • https://alnahamgroup.com/userfiles/file/60012222941.pdf
    • http://arlingtonhigh1960.com/clients/881088/File/51577241756.pdf
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/sanuzilo.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/143a39e912aff2260bfda10be21b54e8/jamovupepakativ.pdf
    • http://homelife-superstars.com/image/files/9918124481.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc2084ae7---13156449877.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/02b935ffdfbdc56057e518e5f61bf72c/9124050625.pdf
    • http://staractivecollection.com/resimler/site/files/jeguvofel.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e082a68e---95370448146.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d045a1136e---31851513572.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3j8l0otkpofpmujf3r83uqapq1/49578918225.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160789f78a0d06---rurobizipewuwase.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/i6p8tn3r2m063dustqe5n42ijk/seninedovosomuv.pdf
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/vunukoxituxexib.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ppsspp+roms+for+android+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c0.bin
9fbf2f3a413ddb9cbcaed16d7739d084bbf8f0a803059d10bb8e951f3695770b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 10648 bytes
font_01_sfnt_off0000ff24.bin
7c077c256d227bd903d5aab7928e44a06c4995908d42a5d110c4f1d7689fbb9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 17028 bytes
font_02_sfnt_off00012b93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 16792 bytes