Malicious PDF — malware analysis report

Static analysis result for SHA-256 679d1f44ee628a5f…

MALICIOUS

PDF

93.0 KB Created: 2021-08-13 05:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1179aca020b69131eafd453ebc02d70a SHA-1: 3c94cbc2e6008fa244b6b16bfbd1e2e585b75027 SHA-256: 679d1f44ee628a5ff56036db41485527db57203237e0f5aa443449e60b2694e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of these link farms suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vhenj70cqib8skoc1rag02c0d0/misuvadexetase.pdf In PDF document text
    • http://bbfrontedelmare.com/userfiles/files/97929943094.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/fenunodupikexojadinusanuj.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///bilabesomupexaxe.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/7872691981.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c532f9f428ba18da818b4f7cf884247b/84795445516.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/eqmssou6uhf7en86oqmn29re9m/88905520840.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c342baa6e12---vagojuxamofosadiviro.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c777b7b45ebe9a09284184620b874a14/47959073232.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/74d4658a9d73ad03485d03883ffc0e21/86709827414.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/55360227571.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wibewemikirijujofa.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/72521359218.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210529103229_kj5zuf.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/jekinijalipejufewavevixax.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/25340052836.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/91255338766.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/dapedu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8eee32b7f---45231648026.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/gofiwodererabibuzesujugut.pdfIn PDF document text
    • http://naucseto.cz/storage/tajusowugetiwuju.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210805114733.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607539ed6b019---xatadorotenedif.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8037f66bfcbe2820f221a173444827e5/99086867127.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ab1cf1089---golafosigokana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=most+famous+egyptian+symbolsPDF 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_off00010ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC7 16228 bytes
SHA-256: c9288532d73307062504bc08445500eb155428b794dacdf776645a36b6942897
font_01_sfnt_off000134d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEC 10948 bytes
SHA-256: 9208c337e73a1f6a66aac31965313a367e81deb32fdeda9c53ec3cef324959b2