Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e487e455c282b4…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 20:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d5ac809dd2c718420ebf2f6e77c5325 SHA-1: 551cbb545e254f7ddeaf80ae58eea4cbb87f5df1 SHA-256: 02e487e455c282b48cdf0f28eda5eceaa1f612092c6323e8f0db7e09eae3b624
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URIs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=pdf+rpph+tema+alam+semesta PDF link annotation
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/v6tdgftn1j08ivj09sm7b0qrk4/bafanizezajozagevifamasa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b371e5e46ed282204d4389316960c4cc/69358739981.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5ced621b5---setexozowetox.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/nebabisugamufedof.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/38687953024.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/masetajiwilamarofisipo.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/87049931786.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/caaf1a375f5ddba0f4ba41f7b42e5cdd/93513063317.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8dafe299b---vexisefuxe.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210902142609_cm7jol.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/terufuliwugenotabep.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/5834493876.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/sazetijobaxora.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd3d9f597---3801241165.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/fafuboluweluvenotex.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5819bdae9---85946449810.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b38bf026161---17227975394.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/71675953953.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160926cdcc8650---logonam.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210607_021818.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/57554119087.pdfIn PDF document text
    • https://estoniapools.com/contents//files/jujofova.pdfIn PDF document text
    • 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_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 17972 bytes
SHA-256: 3d92e1de315a915c8c97f0678f4fb659bedc3a96335dd40ae551dbf02b928862
font_01_sfnt_off00012b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14360 10448 bytes
SHA-256: e9d76b7d69a253ef8d174d72162c2a80b87a2663e956d8e97b62ce146c5a68f9

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