Malicious PDF — malware analysis report

Static analysis result for SHA-256 914e4e3af8992c88…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 01:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3cb70fa86ea11ee2e115234c6633ff8 SHA-1: 4ec475e3d8a0e166075cec88600b84502069b4c2 SHA-256: 914e4e3af8992c88eef1d83995b39b96d6e9e022995f98b8c92b0e05330a50bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd22488937a---madanoxupiwozobutalova.pdf
    • http://garderoba.sk/images/_file/rinobugedomidewojupe.pdf
    • http://hgbs.de/userfiles/file/62639937317.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c600319ff66---54444227394.pdf
    • https://behagi.eus/files/galeria/files/rewediwu.pdf
    • http://drlalashow.com/php/billboard/uploads/file/37701666444.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1c9c0ad2853f12c84f32fd1cf3f893a1/8069837700.pdf
    • http://szguilong.com/userfiles/files/tizesutapitoji.pdf
    • http://igigeothermal.jp/userfiles/file/kunuxov.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608769982731f---rujugawazuz.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210730_841D41ADB10ABFFC.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7dub7urcte85iia2rdu7n1b5n1/14459186884.pdf
    • https://noddy.nu/images/file/mofowagelizuwipojarowagem.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4e21e9121f1cfb46397f0a583533fa87/16959334587.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2536e0037---fugeferazoloziporabuwavik.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607919b361bba---zemekixuvuduforokonoteru.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ce8fbfdce2c265444f70053024863547/rerevivulaxefimefisujo.pdf
    • http://hyundaiokla.com/uploads/files/jegibufeduxusijew.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/gibomapuxabomofoxebemotus.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/rojijinapalaju.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/70120470526.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091eac5ec671---nelaxaxelen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=imperial+march+download+ringtone
    • 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_off0000cbdd.bin
dba2d47e4fd957e78b6cc7e5cf56444b2d2da58faee4b52eb9775841e6a205ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 10832 bytes
font_01_sfnt_off0000e473.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 16792 bytes
font_02_sfnt_off0000fc85.bin
f3bc6f166955376bbf38fb5d2d8032fdf5d152ff14e722bf82be4d2eceaed804
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 18676 bytes