Malicious PDF — malware analysis report

Static analysis result for SHA-256 be868f6687b7950e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 07:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdb75aba479ea5fbfd2d8d138b05e44d SHA-1: f6e4ba431ebaa338e46337b0cdb893f8b5e74f25 SHA-256: be868f6687b7950e5af84932b96419392078f16ae230de248ad4c86da3a95039
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of numerous external links, many pointing to PDF files hosted on potentially compromised or disposable domains, suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://atl-50.com/files/file/53848790198.pdf In PDF document text
    • https://nenanhduong.vn/Upload/files/zujifom.pdfIn PDF document text
    • https://jetaime-shop.com/files/sumejax.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1786660977611bb32658b1c.pdfIn PDF document text
    • https://digireg.at/upload/ramitijapinedanegugotove.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/87157e1da14c1f93f0f9e9e8b3ac3394/xixevok.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7820082043---46977776269.pdfIn PDF document text
    • https://amblamy.ee/upload/file/suzexirevaje.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c25e85bff---museniwi.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/faxebuxu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gudifoxadulimu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607794b753808---jajewujomokexajegukeb.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/768c42416f669041efc5449c62f886e5/rokorexuf.pdfIn PDF document text
    • http://amandamaitland.com/images/file/fuwokijetoxi.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/peweliwotifafi.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/37396859692.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/36072846794.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16079f028b2b9f---givedonasirokuzidozixu.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/velopevulilusemivu.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210815012917.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/30001494665.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612709a6c6928---22706332936.pdfIn PDF document text
    • https://gangnampools.com/contents/files/46803800249.pdfIn PDF document text
    • https://chp-travel.ir/data/file/butujaborixuwiza.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/nikevojag.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e14065def220f2e39c666151965c7b3b/lawekawu.pdfIn PDF document text
    • https://stvorki.ru/files/file/gefuboxirubin.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/afa0usoe0a6se6d5js4hdv409r/gugedogav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=italy+english+dictionary+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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 19200 bytes
SHA-256: ad310b219b8cb87f2cde79d2be758f0377ae5dba5031a5559a4ecc9b89eca63e
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 10964 bytes
SHA-256: 3164988b386652d64753aafc84d3c10f371c19f198b5f8cafe42679ed424ee49

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