Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8efde17c72ec60…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 01:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48dc077dea45b8f2b530d21b5ac1ce40 SHA-1: 8908d1796b55542ebf72c750fa39a7c3e552b98b SHA-256: 2f8efde17c72ec606c44dcf45c284cdf953ff4f5d96bb7329dd6900584c4652f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=compound+sentence+and+complex+sentence
    • http://classicalgardenornaments.com/uplds/file/31264419960.pdf
    • http://szakkepzosiklos.hu/upload/file/4545549460.pdf
    • http://ecandrychow.pl/Image/files/2523001221.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0052c50046f7fdf677fdeb978df69a78/91642580853.pdf
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/40994049033.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/rejupodoxiwemirunoraw.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0615123d2---puwosel.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607201f05c5bf---xeroxitip.pdf
    • http://vogiantinhmach.com/media/ftp/file/wifovuzenetoniliwab.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/3832e5ce964e867d4ec457118b2ec429/46551669431.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d908aef36ec068113a44586722dd6f24/mevofujopurakozizo.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/18e1pr1hod7drniq7ohbrfg1v3/219278319.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/373d3b20ac46d87caf0f34799e08a5b5/13491341577.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e0ff6bf45a785eecdcb24d38ab322848/72749981400.pdf
    • http://vizesblokk.hu/files/file/nutipupasisitin.pdf
    • https://cottonweb.net/userfiles/file/weruranufamiradodirotupa.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/3774231b1da1c92c6d91431bfd526d67/wadepaj.pdf
    • https://actorconseil.com/files/file/19527246488.pdf
    • http://dmhu.eu/uploads/uplib/file/29909501429.pdf
    • https://svingenieria.cl/userfiles/file/lazuvubovadodabutuvimepov.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608701b94e551---16918814387.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4dc3bd6dd5296ed6cdd00bef25d5524f/11981306476.pdf
    • http://phunhai.net/upload/files/figuzomapoxoxuzud.pdf
    • https://angkortaxiservice.com/userfiles/file/zinufedalik.pdf
    • 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://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_off0000f15b.bin
c7c9327b44369d32977f9db8ffd8f3ab2fb851093dae32b20ef0d028152b1d85
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 10716 bytes
font_01_sfnt_off00010a02.bin
d233ed083f14e9507be9104bb81294600aac996aa82be88f5bf6e9f16179f8e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 16808 bytes
font_02_sfnt_off00013572.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13572 16792 bytes