Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c39a68c2b6febc…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 04:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df3d43de83676d2bab309fce5480013b SHA-1: 1b0cbe57f34a7d0cdab5f5c4d7533f25b15fa65a SHA-256: 75c39a68c2b6febc60f19ac0220f267fc44fc1fc520764b93ef20b50f2af7d0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. The presence of embedded JavaScript (T1059.007) further supports its role as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://nepalonetours.com/userfiles/files/luvoregif.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22675479f---3958576655.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/kelorasumu.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/jusasibusurosixibon.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/guzetusi.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fevasaz.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/6174553361.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/kutaka.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wosofozi.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/dutizebojonajepuwenad.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6c736eb5---26710497164.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/nisekebaximokazuxoxorubo.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/lodikiwurafonapekizuxa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/hbmdv5khp7s8hn1m6bcebmem37/vesovawor.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/17607474915.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/10189360405.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/musiwapawatimazegokajoja.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/jetivivo.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/93901081704.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/petekutukevowum.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/74907457332.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/63917845610.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/81939911912.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d06f5359a9---76850153308.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/bokesudakikukabunimam.pdfIn PDF document text
    • https://kimcert.com/E/file/defixigedipevudojid.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/92419711068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=super+mario+double+dash+romPDF 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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 10772 bytes
SHA-256: 4cc2b1cc16390f733fe22f45581816f748b9e5978ed28cb850a8dade4eb6af6f
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 17448 bytes
SHA-256: 9d284327859196d77e3fcc7321e0dd72620042b211a779f1e5407783debc1eab

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