Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf12c135891cb611…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 14:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77624aac4aa43a8c4d341b3ef943fc49 SHA-1: d7693bcae089acd9d0ddc1522459e1450d13e062 SHA-256: cf12c135891cb61103d4d7da6842340fdd8071278d6793647f87b1a0efcd659e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The presence of a download button lure further supports a malicious intent to trick the user into downloading a payload. The ClamAV detection and ML classifier strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=is+fortnite+still+free+on+ps4 PDF link annotation
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/2942835612.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/94706996517.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/43846327378.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/balefeta.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1ffeedabb0c8c792a93efada7ed29e30/wowuforodob.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/91034270442.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/382fe0ff4879158ab8728ff24193cd1e/mujakitorifimid.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/28698498008.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416f69aae8b---tudin.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/vewikajebafaderoko.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/28748304561.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/38310650504.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/44410470264.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/86874899973.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/rixeruz.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/30880213dd04f332db011d82ed122fb8/4035311152.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/90410950899.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4bb8837fd15a474f5c9c82fcff03d42/64432795644.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/38264235418.pdfIn PDF document text
    • http://greenglobepms.com/uploads/93970139018.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadakor.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2807608b47eb2767e51eaae11daa0fab/maxujovelom.pdfIn PDF document text
    • http://apicn.net/upload/files/94081935690.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d3a72e81f6f05ec1d1c8e0b678ac6b48/31729608464.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/musinekajuzude.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_off0000d060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD060 17616 bytes
SHA-256: 455edcef41ecc8fbd551a869ff715c70e371d8f69bdbd3ff19997aa3731afb56
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 10220 bytes
SHA-256: 0ced8058ba2473da72323261ddeaca73e3fde4dc8d9770c7abb76d15039c6566
font_02_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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