Malicious PDF — malware analysis report

Static analysis result for SHA-256 520f58823c0179b2…

MALICIOUS

PDF

79.2 KB Created: 2021-08-21 21:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 94d112bd8e5691cf9d29fb8577fb003c SHA-1: 4ba9e4aa2144f4c892234f7726524f18327f6e5d SHA-256: 520f58823c0179b264b954bb2ee51ea2414d63b91e5ee2b7180a32b29e3ead0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URLs, many pointing to compromised WordPress sites and link farms on disposable hosting, suggest a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely attempts to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=crestar+ceiling+fan+remote+control+manual PDF link annotation
    • http://turatabor.hu/media/67179102597.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0384320ea1---dunenefuwavadupemilumot.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/rodebabulenezovugiro.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a58c37193---1131486610.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/kalojab.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf744318d---70235464913.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c67f6741e---nibixulotifuwowuki.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/23213127722.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/61297102707.pdfIn PDF document text
    • http://aps-mes.com/files/file/40602330046.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160865805ae5ad---82830688440.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/kfoq9lmmbu3p31rimnqc0n5cmp/wozamesebovivikuxeni.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc37443eb---fufiletexe.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c50151e1---50772061453.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/34216439801.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050115570869.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/stq3nil9vuq2c7l5ooijosovmi/80628844462.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/sujikebitedabiwudo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/56067265494.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/591ef9e8380da5199d5d1a9138ff1a8a/mulesuniv.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/miladufuvovuvaz.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_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 10808 bytes
SHA-256: fdf1a87a59bb80f3cc6e012fe393ddcec090808cb69b2bd770926db0a9b57d75
font_01_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C8 16428 bytes
SHA-256: ad8a5c766caa224f6c89dcfe3f78602047c630cf7603aef84de7a3a9e665db2c

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