Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e6eb102ec3af67…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 04:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc6540d0c3adb5e9d7c2de0a48e22364 SHA-1: 8b148efbc64c4bf5f87b3c2f93ad40d6ae3c7beb SHA-256: f1e6eb102ec3af67cae896a1266a04e064f88c7dc1085faeb6079d1dae57ab36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160af80aad4c31---zirinifajoxubagizasuwa.pdf In PDF document text
    • http://tecsun-moscow.ru/docs/file/nojak.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80e11e177---97707624632.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/1355917234.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/41981563360.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/56830648098.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/pamazijekugaselilipafowi.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/perazebofokuvavajetaw.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/54240347487.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/78678676129.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/20176553432.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/xobogipulep.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/83458938626.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/gavasexib.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/r0poc7icq5gsenafvtoji23k0r/8122208457.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/25a5f2215f4b16a554b39c8213a5dfa6/sevobinokonixev.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/taweve.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vf7h6qf6upc7542cmmtq6abgt3/41224631184.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jodej.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/nijawunonenuzokotajunewa.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/23c88fb90afeaf694c856c3335e60ab2/49474863792.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/29058127760.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/62d260519794443e1b39f70ff875ec30/96901707259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=moral+incompetence+meaningPDF link annotation
    • 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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 10540 bytes
SHA-256: 88f7838b34b2d74b098b3f7110bfc2837d1c87373df7046be6041430c7882e79
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 18252 bytes
SHA-256: 14dcddec857f41d4aa5f298d710362fbbe18bde5744314453353fe7c2ed1c975

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