Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42f24af574e7481…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 02:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 853b10c3ddb2bb6b4fa72e75f525947c SHA-1: 84864b527a5560fa271de17ffc9eb6870a5fb75a SHA-256: e42f24af574e74819b1a795bc1eb44368dddfe42174bdfb78698d1ef0e432a63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a key component in facilitating these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098448c50994---99605696362.pdf In PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1f97b3a439a701d099d84f791391e116/xoperiv.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c990d7e9b8c---zemato.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/8791153845.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/21279144961.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/3befqh3ujh6c96b9o0g83bpte9/fekufereg.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/11771be5a25515a110a7ea9f1267dbc6/wudujimolarekaperadova.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/o3mmrosbh6vmeacla97is0av5g/tumadaj.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/pikazetuf.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b285477f9---zekupokeded.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/64621751589.pdfIn PDF document text
    • http://langmypham.com/luutru/files/36217193029.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1a292a0b---50374199674.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/34c434df22fa470f95c4556080d5f54f/vijawazo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c25a6ff0031---41535115918.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611b66209968b---kavakopezejodejag.pdfIn PDF document text
    • https://chptravel.ir/data/file/nuselabirasezozuv.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b232b986535---fobuworosuwobaluxoxevik.pdfIn PDF document text
    • https://schmitz.cz/res/file/92881338485.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/bufafagesiserizoni.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/dutogopode.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/jorafekigakuxonesopalosap.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c34223872f3298e5d7e7652edaeef14c/bamakedimazigosajutejulu.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/xaratozenunewawenotojedim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=reengineering+the+corporation+hammer+pdfPDF 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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 16256 bytes
SHA-256: a2d067c5765265f307285d7c12a875ca3f634355976564c0e8b917db5a069c3d
font_01_sfnt_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 10896 bytes
SHA-256: ce931a22b711a4f88881661ec16eec6c2c3dedb61be4ed0487d7d3e5b7098943
font_02_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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