Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2560a07798c571…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 13:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1671492636d29acfd954d909157c6df SHA-1: 8a4fd6a8346ae634dc95cb23966af318621cae08 SHA-256: de2560a07798c571d4e64fb32c520aba1b015b7b33877d52078389cd4b858b99
216 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and employs social engineering lures such as a QR code and a prompt to install browser updates. These elements suggest the document is designed to trick users into executing further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=opera+mini+browser+android+review PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453134322a1---tanofosori.pdfIn PDF document text
    • http://8njl.com/userfiles/files/58296163623.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3875c636---jejagamomapinanaj.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/66744896204.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/76922380050.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/bafeji.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/xuzetoxe.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/babikava.pdfIn PDF document text
    • https://kristinanamaste.eu/files/gazejip.pdfIn PDF document text
    • https://olterus.net/contents/files/popakofadike.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/75582654064.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/6835285521.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/83125426781.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/675ade1b61c295f934334aaf4b5e035e/wigakipijoxulexixix.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/beviwipowume.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/wotigin.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/89267537544.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/32414911238.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/22917379075.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/guzawolelunizevaki.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/bigowosekewuvuwenobuba.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/26076774554.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/tuninegajurowesujalew.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_off0000b916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12D 10728 bytes
SHA-256: 6c98db355a07dd99551d8095b01f084ca11f6ec581a224cb9a0170744bdf52c9
font_02_sfnt_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 16060 bytes
SHA-256: efb6bb612af90651793aaf290cbdb0e4eba7a5468dfdcbc6f7b7c3e914110470

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