Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ffb6bd6af84d93…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 03:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a11ae024a865e32d61cdd5b588437f38 SHA-1: e53ac8ee85f94daeada1c8efef0b2ed8ad859794 SHA-256: 31ffb6bd6af84d9300045924da2ca9e5a056f7550ebce7c0b508a9df4cac5d3a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF that uses social engineering to trick users into downloading content, as indicated by the 'Browser Install Lure' heuristic and the presence of a 'Download Button' lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various PDF files hosted on potentially compromised or disposable domains, further supporting a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://stellarp.com/userfiles/files/zizoxoketorofedizisobi.pdf In PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/4776934671.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/fimavadakewifu.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bunedikilikokapemoju.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/sumivogupuwikuzowem.pdfIn PDF document text
    • http://etre-belle.su/images/file/35907286754.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/vulekanazuzekiwopif.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/duluputaduxuw.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/95701411132.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/74935905138.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/piruno.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a75de0789---pizuwesulujaputokew.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/sanibu.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/xavavodosalekakawobur.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e7f311bb---94586165704.pdfIn PDF document text
    • http://apnm.indexint.net/ckfinder/userfiles/files/makalurezufipal.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/66832328869.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/6038945972.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca57610c4---61772612763.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f616746c79---nadijetusenetu.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/34639782745.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/81699611077.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/58q265qp30om3mb16a4o48licp/43092010026.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210917_9A58ED1CA54E2C7B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wifi+hacking+tools+for+androidPDF 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_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 10708 bytes
SHA-256: c4012540ee5ba2697196da1ae75c6fb9cc2c8ee689a6fd13077fe43a6847f54a
font_01_sfnt_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 16616 bytes
SHA-256: 60528ddbce11bbf044f59b3cb51e53ec7857bba41145dd8814acea615346b787
font_02_sfnt_off0001152b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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