Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65436ba1c07fd82…

MALICIOUS

PDF

90.0 KB Created: 2021-07-14 01:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98a0a16c74c5a827bbf615a943551c01 SHA-1: 1d9aa3b30070643ad74be8824bb54d9d349b71db SHA-256: e65436ba1c07fd8220c966997ff8470e47b321c2712b43ec3c17f28731b22066
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/3shh8meukvcmaf43d1gb1755b7/62840860184.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2ae41f0d0---mibonawabovozoxex.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/11488858137.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/f66c56acc2db3b3f593517e44a7b402d/sudutetazanukidezezepurus.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/908a5bddc354514566682accb9d0b4dd/digerovuzivabudo.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/napexemaduwikomuf.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/376ed29c679f6bc0ca5121eef882df0d/76515192034.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/sowimokokawijopojikopus.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0edbb968f---weferifomirakezowu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a28fdfe9c88---33433212908.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/70986266516.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/19758962647.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/95654547098.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f2aaf766b4c59ffa40d0b0df0922af92/17664564401.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac14d6d955---60317306990.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/sujani.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c776aca2e0---89773024547.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/lowebudozexepalurenewoba.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/pololabalinox.pdfIn PDF document text
    • http://splogservice.ru/content/file/tadozanufatixiduva.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/l3b9tobsd00u8k88lujdvvd3db/sijetizamibuwiwewuzedalos.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dhjgj2tp74hb2ih6pe9fr91dft/mijinujejupuwarubulupu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/47fe3fca0c7c686a747fe473d3e7f5f4/tutikiberegu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20da5f29f23ac0e6c5d4fd1de8749bf3/bugivotopogulowiwawosefa.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/97109184108.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/konuvulomerajavurowulot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+grey+code+star+warsPDF 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_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 10568 bytes
SHA-256: 70d2452277e8b52d811341312d2417f37abaad51951420d330f7d6533d2f2d46
font_01_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 17020 bytes
SHA-256: e0f8d811f8631e1060380afb51df9809aa2f79b96f0c1a98396f0b1f3e4a9906
font_02_sfnt_off0001411d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1411D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1