Malicious PDF — malware analysis report

Static analysis result for SHA-256 3540739c0a1c8339…

MALICIOUS

PDF

111.0 KB Created: 2021-08-06 15:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 286c64697d90005458f4bff9d7d4d088 SHA-1: 113a367be371f20768825cd9df04269d8b7855f1 SHA-256: 3540739c0a1c833988a6f1672ce985ed03f7132138576a41e74b9313c33a49df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest a tactic of using compromised legitimate sites to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9608cc50---papitumudo.pdf In PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/8319180422.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/dadirupetenopovak.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/97453451946.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/lijofibutofuzewi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7336bd3bbc8d83c805ca2c85ca9c48dc/24954964899.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/32639643372.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kituzogavoposefopur.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vibikexojesifewobas.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac605e392---21983438584.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/07cc9fdf0dbeb5b74d37c9b053c84643/95753822391.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160959209d457e---wimilatawubababusopi.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/23242034417.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/ronugugeminomufuwofokuzik.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f2dfc266b13fd6ab56fe897d0243bcce/jibaxukimezabuwirev.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9638c14e5---winogomokevekirare.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/parakonotuzalesadoneniwus.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kimedigukusakopuzabenopu.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/7177677922.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/miputojalojifeguweriwuw.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/30262917412.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/gumatelatelo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/30316098331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=reactivo+limitante+y+en+exceso+ejercicios+molesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A50 10848 bytes
SHA-256: aefb9107e00986490be6d5036137671d9adedac93291b9800e6287cd8979edf6
font_01_sfnt_off00016355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16355 18648 bytes
SHA-256: 742b4f109f990ff0dfa026b28eaf4908c9c9580e77c5dd8391c4052bc481b50e
font_02_sfnt_off00019331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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