Malicious PDF — malware analysis report

Static analysis result for SHA-256 940179d1c5a37e1f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 13:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f7f39ac2bc9a3d35ceed7a03a1664c9 SHA-1: e712d14d2dbae4cc98de1120c6504dbe95eb084c SHA-256: 940179d1c5a37e1fd60a922b4d68668ccfa4a88fd2da50d030d67790b31df75c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs, such as http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dabf033e8---renoxavowar.pdf, are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • 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.
  • 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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73ebca4dd---dufenorajun.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dabf033e8---renoxavowar.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/848064729dbbf92cadeaf8d56c251777/91255513847.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/a5mi16gk7bonnddaa6vupkbgn7/26043523867.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/88222376989.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3857e208c3---jogokitu.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8650bcfbc---55586143143.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b9f9abed76---58790837228.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5c4dc1b1---86113795438.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/da4afd0b1411689aad91dca02a7b9976/11764277821.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4d7161b3---8753622405.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/neh1vrd3gk8aqu4oe2jh2jinij/nesepe.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/zixeduwosatarukumune.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/58086140619.pdfIn PDF document text
    • http://metallpress.ru/files/97949183775.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/biwugekitaluvoxosabi.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/86171587545.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/senibesuxibuta.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/sevatomituxavumobibunuka.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/70e280b24e868b77266266d9607a3702/28762264794.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2533a5b0---fefitozinas.pdfIn PDF document text
    • http://german-ex.com/57510422398.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/xukunumuzaxivipijimij.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/i7d1l11qcog9libli6egj81lud/29715874416.pdfIn PDF document text
    • http://becucci.it/userfiles/files/napigosiri.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/36451655328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+cook+fresh+baby+lima+beansPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 17768 bytes
SHA-256: 382d9c5770529d013a6d2935e5ec175fee3addfa34b50f8a9c1839d2808da4cd
font_01_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 11024 bytes
SHA-256: 28a8bdf52cb9de8d63dfb9884d825cb8749c24e9671aa1ed3847700e0659fa46
font_02_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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