Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58a5833ac9050f7…

MALICIOUS

PDF

72.0 KB Created: 2021-07-27 03:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e45bd38f5a866076dee56033fd97b1c4 SHA-1: 9290b7ab87c7a1aa9af85a9df9bcf29e5789bc1e SHA-256: b58a5833ac9050f7a521296d47621b73e983486a03ae007b82e7a2515a54a25d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript and numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggest an attempt to redirect the user to malicious content. The primary attack pattern involves a link farm designed to obscure the ultimate destination, likely a phishing page or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dichocungtoi.com/userfiles/file/77604244008.pdf In PDF document text
    • https://eobliecky.sk/userfiles/file/91705774837.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/zokisoxa.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/s98j7b358ftptut94v6hbnfptk/gigiliromozipojabe.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/83989545045.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/damike.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/widakipusimibifimiwona.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/60d2d19f23e6522fbad60c5ac4873cd8/nitotu.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b0e69aef---dexovumajipekogefezilama.pdfIn PDF document text
    • https://kede.org/userfiles/file/25969020633.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/db53a9c277622fc55d8e7055d23cc1f4/16266739559.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/sisekilaxogasezagutop.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/68648117204.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/8267806593.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59c336c65b---kesirelugu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9d5f0807---92264359648.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/8dq9slfhurp5ko06khrojl8gi6/19061512174.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/mirek.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/73073999208.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/26519416058.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/202b948f72c554f17d0a319f841b53bc/tobelabukofusu.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/80847087747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fdmr+raju+singhPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_02_sfnt_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 10508 bytes
SHA-256: 8a0261d53f6c064b1129256fa0814974f85026d2911c3512ec4f0fc97ab0c032
font_03_sfnt_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 15824 bytes
SHA-256: 2ea7014be6a74e76d25b7f1b2fe6f5d3e4f4d1c8cd68be763d378acae7d1e5ac

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