Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb3c8bffbebaf10…

MALICIOUS

PDF

90.4 KB Created: 2021-08-14 17:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26ce77f922380f9b60006e5c56385916 SHA-1: 327c647c16ab2740be01a8d4935daacbb3b4c00c SHA-256: 1eb3c8bffbebaf1053c9c32ed3c0589378d61b0195802bff0f4f99cbb0398975
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the ClamAV detection and ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste content into a command-line interface, likely to execute a malicious payload. The numerous extracted URLs, many hosted on compromised CMS platforms, point to a broad distribution effort, potentially via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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://wingmanresearch.com/userfiles/files/rokobodawoxugefidoxerizef.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/tamirolesegukemokanebet.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7df88a5b48e9cc833518b6d7fcd24181/lazaf.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b609770ec8---ligimutizozagebudolig.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/givabi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/6f19880a42e60ce0f7aec8e77e732118/23545524044.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9f3ef7a9b311e6bcc9d024ae5b63e33c/36302729460.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/a73b4dafe0cd5f91fb908d1bde900c31.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe814d792---josamujevurera.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dabf033e8---renoxavowar.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/33273125435.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/74643933569.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/311540ab0db14c878ab160e18d94c319/jajutomeju.pdfIn PDF document text
    • http://tencanpowder.com/d/files/49914945013.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/lovebageguwopevatubajem.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/xuditixuxaralib.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2fff2409---ziwojar.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/momikemozabagijezeji.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/tikokagekevufijafud.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160820b69da52a---97128225038.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lirexekenijovamumur.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/79282255746.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/xebexaxisiviximeve.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f433d2bb---78519082875.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/10450226608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+pendrive+bootable+using+cmd+for+windows+7+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_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 17320 bytes
SHA-256: 886befc5bd539bbbdc2ca836bd467f2147e637c275862bb3d53e0de39d82cf98
font_02_sfnt_off00013f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F48 11488 bytes
SHA-256: 18d41ca82c90731f2de694d30b1824d14f42a4c106058a1923c7aec4ad33c1f2

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