Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d5ad4e50ef1a08…

MALICIOUS

PDF

75.9 KB Created: 2021-06-26 01:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e64daa36a2c9734395d5f04caf3d83fe SHA-1: fdc131825a3f5f1c8ba62a3d4ce1ecfdeb572f67 SHA-256: 68d5ad4e50ef1a08bd24d4aba97dced62853ca73101e5fb3f065dabbb80d54b2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://addsfly.com/userfiles/file/32590448937.pdf In PDF document text
    • http://trimblehighalumni.com/clients/84492/File/41161570827.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/vipeporozorabuxetalekeve.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/56982360558.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6aac10ff---83238895952.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089e1f323b3e---lulepanagabaruxerinopu.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/puruxupewasufupurogo.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/78772965018.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/97023121941.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbe0706915c961fa633053452ff89425/mividewajewozorimabiz.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k8cc6mlhfqf0s9jhu7av46gn67/18786732649.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/givifapi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e82a3debf---55762616523.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/75566727419.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074909eac432---sotakudapulafuxabeb.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/suwofuvomurowepix.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ce02d001---15383003940.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/14779254214.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfce3890c---faxojugepikibanurez.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc1f4e06f---47644561498.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10548f7ae---vutiref.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/bgvons1o5n0889gmkrq82j5amt/pekatuvovuduli.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/69421368364.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/n1g8r48r9gpp3tjogipda24csq/fidamatogexotuvubanoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=30+kr+to+usdPDF 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_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 10092 bytes
SHA-256: cc389aaa6c136beda756e7e0dcfdc630b9d72331320978f9ddfa5eca5624e11e
font_02_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 17312 bytes
SHA-256: f50c7ac941dc5b44314fec292d498af27b8d04bc9d4e0fab250f417b10945c16