Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b79ac7c65a14545…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 06:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58d1373e32a6a3e66803e6713b2908f8 SHA-1: dfb5d43a1ada8c4914b86f967484b0758d231538 SHA-256: 3b79ac7c65a14545d7334ee1227bac8521e7da0066ca8a54ef9cba477a4bace0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and numerous external links suggest it's designed to redirect users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gt0pmrghde95rsfbgaumilij01/kubuxorule.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tdpi1qvedc4mfbohqnn9l91kvt/44577370399.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b009d65e---wajulasivototu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608206c2a4933---18957511785.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d06138b67---67455751328.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808fd11d042---bodatupor.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3b964ebc---68887584070.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/sawijiruxerutojuxutomex.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/bekefugeluliludeto.pdfIn PDF document text
    • https://iranjobex.com/cache/fck_files/file/sefojozex.pdfIn PDF document text
    • https://proxus.nl/file/vamokela.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/17730017507.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/15895134434.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/40880473959.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cddbca808085d72b4ce4018d3da0607d/49257595202.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/97919704208.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/7e0028165e57054ec43937da34ba1403/5170070132.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160791a674c0b4---40680836897.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/neralufo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16113bb418d319---15769769340.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed70019547---38258817601.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749bc56012d---63981854881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=function+of+primary+lymphoid+organsPDF 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_off0000b83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83F 14532 bytes
SHA-256: 56b7cd169251bb2eb57a31a792981909c9fd3e4dd1ee6d54a6a1d417553d525f
font_01_sfnt_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 11128 bytes
SHA-256: 5d897a0f481eb90aea70917e7317c1836e6554851092072db4e731185b761c78
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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