Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a3fffd7a76d1b8…

MALICIOUS

PDF

91.9 KB Created: 2021-06-24 13:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 170bfe0fd084e06e625e5c023be9eb23 SHA-1: 92397e398d8306369cf2c19be3eaf0927b89635c SHA-256: 79a3fffd7a76d1b8d98be589dbe8a306303cfdaffc6213c8baf8a513d8318edc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=vision+ias+world+geography+notes PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/647595ffbbdab094e35b0260d4877f9b/31817667202.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a70a4f69951a1019d0c565c283e66d62/zubogajedi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/39bbfba8a1691b822c6d16ad5e4332b9/22724351433.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4f975ng6cr51p454p5uhpkj30/97498605096.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/hnodvon5jo8bodtj2d4u81s8h5/dedes.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/17325318082.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078d0d7d151f---24694771803.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098149943564---85426142035.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/46688244340.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ouqajnreh4spiqqsdkmp90cju1/zikixataviti.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/40255649563.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/17070203902.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c6e892677bc6b129f3b13b9f2f5c9b2a/giranokizulito.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ipbl5a87racvstihss8jqiq5r6/rikewalapod.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/daletilopamusabakesoziwo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a956544e951---liligutazetunopuvivele.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/54208998483.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/97a6b5bc6b42431689395294bdc07149/saxexivasemidimod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn 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_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 5380 bytes
SHA-256: 5183c630f98c9cd98a424cb369795f24303e82c321792b2023d4899931755078
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 11756 bytes
SHA-256: 97ca5390fb36fdceed297daebd6bcc10f8ebab978ba38910017dae2498e32e6a
font_02_sfnt_off00013086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13086 16268 bytes
SHA-256: f691ad396551e0ef34734faeb053307ba7ea77b8ab8ea05125ff947c235cd2a8
font_03_sfnt_off0001465e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465E 8476 bytes
SHA-256: 1800a57f637b9ef4fba7862ae378badde2ab624f990a0b33704fa679578b1b29

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