Malicious PDF — malware analysis report

Static analysis result for SHA-256 32821b843e174171…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 19:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6735a0423b37a71a348f406b5ab47102 SHA-1: ba73021e4cb8046d8c91904fc930583d8492e836 SHA-256: 32821b843e174171475c928bcdb195f256f35aab497b58f63b7938f8aa453b53
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised websites and disposable hosting, indicative of a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass security gateways. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hidramaco.com/files/files/46982847069.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5m11j8sup80bpqaq1mds6l0rb1/fepexoxaganepunesepi.pdf
    • http://efuegypt.org/userfiles/file/leboxuwize.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133952dbac02---25970052869.pdf
    • http://mamitobe.ru/files/file/17460674666.pdf
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xelavudilikofidunugizazom.pdf
    • http://buyyoutubesubscribers.com/ci/userfiles/files/nonekutujazanejirotejoreg.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/9930654686.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/mobamoso.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3c0dbec620e6dd42918354b5575395eb/49826460062.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/wezodapi.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/pp987rdp84bmcmqkpo73d9taji/nolepib.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/wepewusogu.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/99980347385.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/zarapaten.pdf
    • http://ryukatsu.com/userData/board/file/24022554822.pdf
    • http://desiaussies.com/ckeditor/uploads/files/kubilusovusesepes.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161420b0dccda9---98653922612.pdf
    • https://sindhuinvestment.com/ckfinder/userfiles/files/7567892680.pdf
    • http://autohondl.cz/userfiles/file/70498119555.pdf
    • http://dichvutot99.com/webroot/img/files/subomovalel.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/96216686234.pdf
    • http://desushibar.com/userfiles/file/60918926041.pdf
    • http://argol-editions.fr/userfiles/file/19650141450.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+unhide+gallery+vault
    • 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_off0000cb3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3B 16792 bytes
font_01_sfnt_off0000e34d.bin
8e9338e9a23fd4d3d7df9859431010078217a8dc9313b0d86f88b1c1b01bb770
pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 18072 bytes
font_02_sfnt_off0001122b.bin
f6e3dc9d45fb3b7dc405ed3cc02bc03a6af9a1b43e0f0fa769f9f10d1ce33768
pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 10716 bytes