Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd85f826d0861d4…

MALICIOUS

PDF

77.0 KB Created: 2021-07-10 12:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fb655f47c2e115d05fcf5235851ece37 SHA-1: 769a458c4accfb6c772a5840809550250b29255e SHA-256: cdd85f826d0861d480bb142c10863b419be73dc8e2ac4adb8a50db7e0bbd0a46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites and potentially malicious content, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and numerous external links point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=slenderness+ratio+of+a+compression+member PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rlcvolg8l5g9ffmj4k4bi8rd1c/24641358891.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/dedewonojofiwapozexegef.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2c02c48d---63408634903.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06850f3eb3---36266748627.pdfIn PDF document text
    • https://proia.bg/userfiles/file/savozepuroxenituzir.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f2fc5c8b---larodesitinemumikuxotuj.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/1n4u58mbj2kvaljg2o1m0e13mm/26466560119.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e64471016---nagoxapakojupanowida.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a53e4877a3d---pazuwuregixajirawira.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/897c600f86acc286cdc4e48fd6e4015e/19632881174.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5a3f87c96d638c52a458e71ea086222f/dekewofobimenuvakalofiti.pdfIn PDF document text
    • http://thepdaitruongphat.com/upload/ck/files/finafakatukadisuteti.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609433ac7fd3d---sebubol.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/dedigumubelutazugoxativ.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aea25aec90---19026823039.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75761e0ad---83154489512.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5n3i7u0vi4ideala96r4ueg5a3/benogamudatijadujaziz.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/869154556.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e94afff3f27---6040200432.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/mk2erkphln80mhmrddpsdqlnrf/76202549368.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83394252582.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/slhfucvt1v9pgkt8rs87fh38p6/38464719231.pdfIn 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://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_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 10996 bytes
SHA-256: 9a8bb9fc79bf5d32dfde6fa617b6d8be55f846646841e0de8b5af21e87df9aba
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 16680 bytes
SHA-256: 30412639143fd6cdce08d56e1f0da1a8a2caae1bf7669f0dc9b625781796ca2c
font_02_sfnt_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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