Malicious PDF — malware analysis report

Static analysis result for SHA-256 1187ee2b219c7d17…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 00:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bfc0c7f960ea846bb99b285a7b22a30 SHA-1: 7e5308ebe827268a295e780327cbe18496a76f8a SHA-256: 1187ee2b219c7d17f40e7decc8e234ee53644a8119456d58d318e4e4ca0d8501
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document's primary purpose is to redirect users to external, potentially malicious, content. No scripts were extracted, but the structure itself is indicative of a phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/m6drf95ag1o4h0p91s8kn62bh7/zinosuzuzeferunine.pdf
    • http://goldartline.ua/userfiles/file/nujuwesin.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/fb256a6efcde1645ede4a3f6fee3d2bf/31210651439.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/599cc5ed1282efeb6fd00dedffcfda81/49864380737.pdf
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/81170173253.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160921e9b08ba7---25978934607.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/918a111ae1c7bc31b4711b67c0445ec8/lawogubelinet.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc541dcf9---timotazatere.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/16250218096.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609656261591e---jekotu.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853c7eb82b8---88027136424.pdf
    • http://blankheich.de/images/uploads/file/fedubogovamukubut.pdf
    • http://zagazzo.com/userfiles/file/gajefanazoxagad.pdf
    • http://ex2010.com/uploadfile/file/2021082212072473499.pdf
    • http://lucann.com/Upload/file/29713600909.pdf
    • http://chickendaylacrescenta.com/uploads/files/4510689231.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba59546c80---55589052368.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a6e84230d---83698620141.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c727ce9639---zanagumugikilunir.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a90889c8af7---86803465404.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610887819a949---safafubazajosulovuve.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/203c4d193e6dcb837695a7df0648c018/lapumuguzojenemasi.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607291cdebcad---93922359246.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f0d0630a---bepobolok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=brimnes+headboard+manual
    • 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_off0000deff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 16792 bytes
font_01_sfnt_off0000f711.bin
8a5f84a6f8bdc1ec7a4c4e61c9a471c76153db89ecf4ef1f977bf4624a6a63c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF711 21200 bytes
font_02_sfnt_off00012e1a.bin
90cc638675d05be2943e8c7fad795672820d68eb4abc4c6e87705db11c9e24c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 10708 bytes