Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b778cc774fa2ce…

MALICIOUS

PDF

96.4 KB Created: 2021-07-05 15:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4d42e89d792265e4d2f37ed9596973e SHA-1: 91c1032e785038d561765c0a5469c63517da4abd SHA-256: c3b778cc774fa2cee1bd72986bbc118db293cc15c576e9bc4259466f2b9ecb1d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aiming to trick users into revealing sensitive information or executing malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://vatlieutaphu.com/upload/files/jepibojizope.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/osgoj5ndt3e6ve47ub0ms8k87p/togiwaseme.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/d3c3f861fb849982871a44d2b58ee286/18987990472.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xowejijemitirawetit.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/92882470062.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da98a5b9baff8e428704987204b02e20/60072462210.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f66aa761d29c318af83c2d3339db7c4c/20739590186.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/04a24da3410a735d73e53f266e856c17/95986314358.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/gakulevebemomopatuv.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d7b5282e---86330712856.pdfIn PDF document text
    • https://maturana.cl/upload/file/9329221846.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf75d85354---fipirodovebejopusa.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/68d4545ea6e567b8937c8a7abd2add38/39972649344.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e2007c31f---koxefujodegumukupegob.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/siwizobirojutabakibatos.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/negubifepotobal.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/vesamofiresobelok.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ec82de20---zivosolenevititonen.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/37450644888.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a44aea2c05e---bazefanor.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/08hpr9gj23etisebrlei4b5gf5/bizefufuveko.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/91993329121.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6014f1ac378c428d65d099773766e327/denuvi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160798bfc85ab1---wagovotafek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fulfilled+in+a+sentencePDF 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_off00010e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7A 17012 bytes
SHA-256: f6d891448ef4417ad56b1080a6878d07f2130a11c8b85900dd6f5b967db1a588
font_01_sfnt_off00013acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E6 10328 bytes
SHA-256: 3f63b34d6152190826da43399775e49cb554c51c9547eb149465d7f460ef569b
font_03_sfnt_off00016a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A3E 1720 bytes
SHA-256: 0b613c231564cba6465e7d49f1b9cc61fd37c9c91bd907bb7cc9ff11f5ab39fe

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