Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d34f09abf3fbe93…

MALICIOUS

PDF

81.6 KB Created: 2021-07-22 02:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3158ac613b85274fefb04dbcbc402434 SHA-1: d9b1bf699f1eb155a72850050045915a03ee1611 SHA-256: 3d34f09abf3fbe9329621885f0914c7e5648dd0aa5c15cb5bd66fddaf516a2e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to lure users into downloading further malware or phishing for credentials. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/04a072564245979902b1051c1cee5721/89059981199.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/muvipapivedirajowuked.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cc160255c87f139b71f544eacf7d2c1/fojukuruxamewo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10b812fc1---52484045202.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6f6a255f8b7128d8b7dd2babad4bab47/84266272009.pdfIn PDF document text
    • http://indecomavo.pl/inc/gaributepirerafilonugu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/i82n4boipj9lcgobh3f3lqethp/64378092787.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/d108817eb4115d3984ad8d0d74f5de15/wijanuvomederojonudud.pdfIn PDF document text
    • http://fedime.org/imagenes/jeloxidifogitozug.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/ximutuvogabek.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd8d84a5f2---40002245354.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083cef52787c---6613547457.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/neduv.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf3782b857---31086029063.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3de3f207---65517733896.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1990284c---rizozadugisata.pdfIn PDF document text
    • https://subarini.ro/mm/file/tadamemubupodipusu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4d295e797c47f7e5f35f52dfca815c9f/rexabevobifebolo.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/20618469646.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe3c3857a---53942335631.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/15356669166.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/41900909646.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rjrm9ohj8shjssmuiqscv7cpj6/23626326789.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/xatizaxuxozikufurexifituv.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/58b70007ceaca547038e2dbb563dc121/92957570239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+nielson+companyPDF 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_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 10516 bytes
SHA-256: c0ac22309b8da50f611df3e11bafe5064438dfb09f4f72b41b651b9b8ff19c40
font_01_sfnt_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 16988 bytes
SHA-256: 1bd2f80e5aa3487d73db83302fefe8aab955b5b60b34492367577972c97bbd44

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