Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c953e1b99a79c8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 03:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ff4d528cb7c6d4fe429b2f65988ecda SHA-1: 5f807676c660ce25e467decfdbb3c158c26575bb SHA-256: 41c953e1b99a79c8c5eb51d669310cb659dcfae19417802e5446c506aee3867c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=pdf+viewer+software+for+windows+8 PDF link annotation
    • http://ipceurope.eu/assets/file/65788138998.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1612e8f461e47d---24540581812.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/wilelobogevolalipopef.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca46684f3d---xajuvagozedapobokuxep.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/rojimajozejosipifosoxexoz.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/22486982233.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b09df33ec---suzoxezawajate.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/8485162358.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/79705236350.pdfIn PDF document text
    • http://servmed.net/userfiles/file/60596229891.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/bilaxavamakomosu.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/39530186560.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fdaadeef---55893970569.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65f0d2a69---39461984722.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/zifepovavurag.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/3840566609.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0b079372a41a0887284f25fc0e8205a5/73995986461.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/kowafilajawuloze.pdfIn PDF document text
    • http://ahchala.com/img/file/jirelisekofiwidiki.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/defigabipilogazifutemuwu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee090b19db4---69635363304.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/679817c06e5ba461b24dd9184de1d905/27749101563.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210821_7207651F461B2E89.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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 17312 bytes
SHA-256: 6eee4a1fff2007c55856050cc5d1aed8467120c6e820e6942dd4d21d269573cf
font_01_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 10664 bytes
SHA-256: db4b58312fb51b4f5d68088b72208b60b119399bc37a190cf8a20bb2250c4cba
font_02_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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