Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8faeb71819d0c3…

MALICIOUS

PDF

83.1 KB Created: 2021-06-10 20:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a92b4aff8eda139df99666d7904d16 SHA-1: 528b1b8f2821b8dae0c251adc1d60c34fdfee4f8 SHA-256: 1c8faeb71819d0c38c400641e1603805f437340561b71aa0a0db9ec37edf3edb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to compromised WordPress sites, likely intended to distribute a VPN application. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or social engineering attack aimed at users seeking software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=hide+me+vpn+pro+apk
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8635a73a802facd39ee906186dff880a/labuwizikeluvamapave.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0ba4e528357dfbb7e584cf00f0c13482/gewula.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/99198966330.pdf
    • http://shuswapladystriders.ca/userfiles/file/jonilifa.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b9290fcb---vamezukixeninogo.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/h6ct99047ikr56cpi1p9ae0b9c/65382524853.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8nnruhg3o6l81142a1i7049lp5/366046398.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/u9n9i1mcho1tumcdhsb8eb7r73/fusilibapuv.pdf
    • http://t-p-fortune.com/userfiles/file/gonori.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5cb673d5e75a26dfe762570f69807f86/kazenibodemiketisunaloneg.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a26638ebcd9---siwusixemerelizefiparo.pdf
    • http://challendor.com/fckeditor/upload/file/fugibijajutizupanoruwozu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c3275d2e---murujozozaki.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a6407845b---73262974889.pdf
    • http://bright-inter.com/file_media/file_image/file/77007297734.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a95902c0ecf---84535230409.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ea.bin
dced9c6a6228dad010b15bfdb8e6237b0595ab821f97fe184f09b10543a9192a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 4980 bytes
font_01_sfnt_off000104c3.bin
67c94506e8bad94514115b86d6e0190c4041955cc51c19e81a16d48dc92c09f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C3 10756 bytes
font_02_sfnt_off00012998.bin
3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 16028 bytes

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