Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff8a14fcda02ddc…

MALICIOUS

PDF

79.2 KB Created: 2021-06-09 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 27fbcf79b46701e1a983e127c1c6641f SHA-1: 80cdc9ac1fbfcbb1b863a75fac55e928fa3dc0a8 SHA-256: 1ff8a14fcda02ddcf61d7e49e894abadd429aa20e47a072c9d1bc25d7005f1a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'Corel to pdf converter online' and 'wkhtmltopdf', indicating a potential pretext for directing users to malicious sites. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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://chcial.ru/uplcv?utm_term=corel+to+pdf+converter+online PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b9113b73003820fb7fbba86813e8e4af/56495874955.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ubup2jpifh8sqa60pg9opk2h8i/muxakisano.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608373dbdc6cf---92004321547.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/eu2811cq2nmu7vqeljqrodch77/dilagifamupanizejosusuj.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/zazovajem.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e25a1df2b360f4f75fabf74e53088b39/21234423834.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/45001564924.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/33628445486.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e8efca5ca8794236449683bf5d3f0316/56010267374.pdfIn PDF document text
    • http://technocom.pl/editor/file/belufujananixisakemanaf.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/67870931607.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ee13e28beb9953f2e5febf5441be1a48/buvizokawi.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607228b735e18---ganakipulasapura.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0e74cfe3f1f4b2c4734be4dca56405ee/866046757.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/72977344276.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/727dd94b54205ed44a77df0448940d54/zawipajulerotubi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c95e8d70e---pifezo.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/ba6a2bc938c69ec08674d7e0da38308c/47828706783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 4728 bytes
SHA-256: 0cdd1f8e9014ce5bf2d32179e0ff5ad81b3ed6df99051efe4d5d036e51780aa0
font_01_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 15960 bytes
SHA-256: 66ce883b5498b40be4501781ba0e25c9d55e71bee0840c7f4159be80a1209cd9

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