Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf33e7afc3f2fa1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-02 03:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d51188f6b8eb0ee482b47517243d1b0d SHA-1: dcf25095dd48c279908495e768b4011e51e91c16 SHA-256: ecf33e7afc3f2fa1db4aba229e78cfc13e0d827b4edc97cc9a1e100cd2a2017b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://smidgel.ru/uplcv?utm_term=name+of+fear+of+spiders PDF link annotation
    • https://htddienstverlening.nl/userfiles/file/buluketupep.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/7411591136.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2e4a85300022a69cee2a244916cc8fc6/zowedul.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0a702abf---risaludolewobo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/zigipamosaxisuk.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/93735270493.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dcc24af7b---derak.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/67008535786.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/wopisi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc3b18b1a---kubuxikupo.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2cd0f9612f57b167497bbbd8224d20f4/zapavifud.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/mobubawikanegefok.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/jesudaxajemora.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078813f781c4---53943942123.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/58861502778.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/lodow.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/3545016831.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/uki16g6dj9v2egl6qjjc74meo6/xiged.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ct3t9pfv00ul82mkeu0ollla3p/jikajipukil.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/21654333291.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/dnj6kc59fbllhnpcq5ch2b6shc/bizetubavufe.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/59841346079.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f65897fd9---gilogik.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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 18560 bytes
SHA-256: e2c2d14bfe593d83fa523276fddb513cc79f6e8f114459ef415f48357009fdc9
font_01_sfnt_off00011c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348B 10388 bytes
SHA-256: efba03cf4fd925ab3cd7906db362277e8a0f078e4ba3a02958247d3d9192d8f6

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