Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa56670f0c112b0a…

MALICIOUS

PDF

84.8 KB Created: 2021-08-20 10:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04091bc4e55d3da230c6846d81059783 SHA-1: e3712ffce4507635957934179e1fd8ec91302d8c SHA-256: aa56670f0c112b0a9cbb2f48775116db81ec53c3e5a5c43e07a02f7cd22d3ab9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised WordPress sites, likely to facilitate the download of further malicious content. The presence of a visual download button lure further supports the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=my+talking+angela+mod+apk+version+4.5+5+download PDF link annotation
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adf07d8bc3f---zimukiluw.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/nemebuwidemuzimopud.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/tobefokiko.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/263ad64be1620c3d562abad21a267c0a/bopegukivapudopibog.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ad104abf---navosinipujolexanuw.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/76175132697.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/65392324407.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca1109126---tokidakefilafowovutivubas.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/94612854358.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/10695611404.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/29441855563.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/tizasopo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f594564f8faec1579a7d9606e142cc3f/wutukol.pdfIn PDF document text
    • http://allasclub.com/campannas/file/jurosobenuvix.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/34895055803.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/ld75tvtb31sac28em5n3ov22qo/kajuzarufidezefawu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760cf707dbb---mofularivosi.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621843940.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/pepuwusikiti.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/34734353874.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671398f70e---68554166062.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/zawozapado.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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 17812 bytes
SHA-256: f272cfecd9bc0c7f6259a4a7c3ae308b08a761a3f6ef681435bb7452d54b54c9
font_01_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 11364 bytes
SHA-256: 623adf4cb7bb777ba3ad18682152a703d2b67913150ee8f833b94ac2be748615

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