Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56110bcf5641ad3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 14:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1513ee0436c99d4144cd157f83135ffc SHA-1: cc3002ebcecaf7104c696438ef18e7e9e27499ad SHA-256: d56110bcf5641ad3781f5fc227b2a0d67b0bd0b33e719a87e53b65464d313dc4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to external PDFs hosted on various domains, including those flagged as compromised CMS uploads, indicates a link farm designed to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lawyergz.net/uploadfile/files/kozatunonojosuvunuwesub.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5d0e03a1---sofirovawururusedonivoso.pdfIn PDF document text
    • http://prograsifkalip.com/files/talipawulek.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/23652399718.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/wepoparuxavinofetapojipu.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/gevukadexekipiz.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/galixesifivalajibumazor.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109190647526606.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/30196134902.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161469ded65c8e---jotatigufadezusi.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xuvojabowodo.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81341376131.pdfIn PDF document text
    • http://www.heksan.com.pl/file/21502578725.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/36983787498.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/44735304279.pdfIn PDF document text
    • https://kueapem.com/contents/files/214439840.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/mamof.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf09278ff6---fubizu.pdfIn PDF document text
    • https://makenie.com/upload/files/tozojavo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35135b9a7---53360655862.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/walawuderimuwanovutas.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/38057895004.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/96338607171.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/9868420727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=application+android+pour+calculer+la+distance+parcourue+%C3%A0+piedPDF 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_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 17820 bytes
SHA-256: 001a7eb5f935ffae3dfe958063330b963281c934e4123f514c28bdca1d04d0b4
font_02_sfnt_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10772 bytes
SHA-256: 77e1529fb8fc4fd1e4c54fc2faf4078d811de1aa8907776e9bb79fbfbd5eeaae

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