Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9e781bd4bfe413…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 20:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cec73564bcadc23af30c167cfad78fba SHA-1: ac2ef85e4f77c65503bc5354fd5e2fc607b4a86d SHA-256: 6f9e781bd4bfe413ff8a3d4990047902cf99213509446b161d48e30f853e145f
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, some pointing to raw IP addresses and others to compromised WordPress sites. These links likely serve to redirect the user to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://philabc.ru/uplcv?utm_term=live+wallpapers+pro+apk PDF link annotation
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/7095731180.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/jaweloso.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/miposokideloto.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///61086333999.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e691a083---juwuverupepepufeju.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/goboxikakexo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kq9mc8hjotrbq8mels7vkkgm60/tizedirufategijebe.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/35537002632.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/81370792119.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/zowikuzowofejamo.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/59510615113.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/23239899955.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614113fc45e53---daweruferofiro.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/garixexe.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ebd7b40ae6e51598356b773a67bf5c8c/wodotategojuderib.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ed0a9e4b3c46c34b91e6050eee9cc257/pegafurejevuvokoxigiw.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210901081845.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/pikuxojewawifokijarerew.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-8/20210908101558882075.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/78365639360.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/mixoluto.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/sasofir.pdfPDF link annotation
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/wivipivagodururirumibap.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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 17344 bytes
SHA-256: 3d9137fdedf54f192d94aeb04274db822b9531435c663d78f41e9706df737e6c
font_01_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 10244 bytes
SHA-256: 87c56ba7a87ffa083a4684e50cc2d508e565282ea03f1803d89140fc0e24bdb7

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