Malicious PDF — malware analysis report

Static analysis result for SHA-256 306f5a50ac31440a…

MALICIOUS

PDF

164.4 KB Created: 2021-06-27 09:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 174dacab1a12eb3a5c45a407b3a2d979 SHA-1: 0e78d099776dae094c9a2a1c734960b42661a41c SHA-256: 306f5a50ac31440a11e57946c8d06503ac11ca0a666a8ff1f4c7eea9956b0b74
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to lure users to external sites. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

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://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0a5605c0aef0f08f85ce1d5ebda2d8af/46217325980.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744805b09fd---migezopujosalufotolol.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rk3q864h3csuugipolajbhc4to/99701735593.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a66a4142207---61225421798.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/mifalevoseri.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/43780e2c2459350648b7ea40fb774621/91198883269.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/b5jujsc57v2oemq6hk1f5cc7ba/90829497660.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/jujuvagujod.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/038e0665812eb59822af8409261d17ec/79973531036.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/58047472121.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/laxapulexone.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/32840637250.pdfIn PDF document text
    • https://puntoagricoltura.it/file/ligaz.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/wejetitudajimomikikepeg.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87871a46f4660b2561ed7df0c22b24c8/78885493772.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4f564fcf---41082375042.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gr1druhj44mggsa75kl111kg81/78603837930.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/zuzes.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ccb930747---53258681828.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210517103036.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/u1n94s1ftbcolnomncaeuilkie/dogaburiwobenenubiminobe.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/jedis.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/39272338487.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/ripifuzunax.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/nuboranedevelizowel.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160784066d7ea3---bapovak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+second+law+of+thermodynamics+and+entropyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20221 11048 bytes
SHA-256: 995b4cae218a64028181080dd368ff7f3a381c3e0fec521bfe8cf6dd6e952ad9
font_01_sfnt_off00021bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BBD 16248 bytes
SHA-256: eec42f0bba4018f6ae412dee0b30f2e8f62d2964327a9edc906b3dc49daea092
font_02_sfnt_off000231a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231A4 21600 bytes
SHA-256: aa4d7a74043c959c28efef1fc6eacec24322e0a62b3d7c3c9cf81bebee367a71
font_03_sfnt_off00026a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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