Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0f06e567d7245d…

MALICIOUS

PDF

78.1 KB Created: 2021-07-21 00:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b25f4029f6e87445865315f47562c21 SHA-1: f9f89f9451cce461dfda5587a35e45ba8958836a SHA-256: 3c0f06e567d7245d385a5d981a71116cf43b35319a8df3f1635f66fe4cb7aa28
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a fake CAPTCHA lure. It contains numerous links to potentially compromised WordPress sites and other disposable hosting, suggesting an attempt to host and distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely intent to exploit user interaction via a fake verification prompt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://ordineveterinarivenezia.eu/userfiles/files/59971961226.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8dac85e0a---12271540188.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/xazugabimonujiwiwefewok.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/makajilalatifaxibives.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/92983325612.pdfIn PDF document text
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/45833239820.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/zozawiju.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608486a2e6164---satanudiwesa.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/44414352172.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/38292405999.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0760911b8cf298d1e86d77f300af877c/85428134736.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160e130b1d19ef---84756166996.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/84242ba05a9bda6b636cd9fe1641b064/bowokorar.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/68714630738.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/kunewuxelikesi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a8bdfb725d19491c513fd26c59be9ff7/jinoguxapuxorafepegi.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/57555276067.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/nigedadaduxelaxuzez.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/96cb92c799f448972504b3876d9093eb/pokuf.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sbf1bphn7r7aul62rug7isudf9/garujubevirodejobaju.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dcb41c6db---44114442334.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zeguzanurix.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a425ba830---47982721897.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ql18tr5b54tfeqr8f6rhr1qgi3/41032092856.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c8c803ef69a1eff984aca410e6a5f01a/javokitotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=independent+order+of+odd+fellows+cemeteryPDF 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_off0000cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC9 17724 bytes
SHA-256: 1d3ef9c0f8af9a1d69ae91cf415ab2fb2435f991b05bed09f469707689fdc94c
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 10676 bytes
SHA-256: 82cab27857299e0f77d3dd38cb3217649ddf1df804495321f1275b37f8232f84

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