Malicious PDF — malware analysis report

Static analysis result for SHA-256 53179e532bc429a7…

MALICIOUS

PDF

85.4 KB Created: 2021-07-12 16:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca2123b870d410f6fda3641847fe7a78 SHA-1: 932e2d541f403006d53d1f848265135d12caf946 SHA-256: 53179e532bc429a7d1fb8cd82f631568fe4b259b816e7cfea6635c90a0e0cb0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbd686b8c9---sidawajepukumuzegoluxedi.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/d657799339c3c87995d7068d55f169d1/80720091659.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/xudigo.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/16f8de2b71e6c1fe338b9d68c6b64204/90768051585.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/25775837733.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd87930f578---susebisibusunuravawav.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a9a887e72---14083850001.pdf
    • http://fishtech.org/uploads/userfiles/file/file/jirow.pdf
    • http://stark-tools.ru/images/uploaded/31281368551.pdf
    • http://classiccar-jp.com/js/upload/files/90412357679.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/390bf0cfb91c77b9d1ff2f2cfb0d64bc/58743276529.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f0e911e6988757fcac084e071ab92945/ditegem.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd23d41e6e---61837614829.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/lokovodaxifuterixa.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2ifqseqd3grqq96v5q74jmcpgc/julojubawewafereju.pdf
    • https://wendi101.com/userfiles/file/19613380171.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0943db90c---23824574759.pdf
    • https://wolfgang-photography.com/userfiles/files/18097528776.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/555546b960c1099c5f4f77a69838a0ce/rotugorurutibexoza.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4b582140---loxizilosiv.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac664ad8c10---lunazemotuvolefufiki.pdf
    • https://eyetracking.pl/userfiles/file/47349475061.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=virtual+villagers+origins+2+puzzle+11+and+12
    • 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_off0000ea1e.bin
fbaa2ea03d34678caeee5c0042c3a050ad2dc5ce7dae842af7f9b3c409a0f2f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 17288 bytes
font_01_sfnt_off000116bd.bin
696f1a582e3625925eb04c135de4244ad16e1979f152a39dcc4edd5ff918a800
pdf-font-stream PDF embedded font (sfnt) at offset 0x116BD 10936 bytes
font_02_sfnt_off00013025.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 16792 bytes