Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d408fa8b73ba30a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 16:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e63b25856cc8f1b5ea7e6bbd448ee87 SHA-1: c95baa87cd7757c816f43b69f0e2c8188d8fca23 SHA-256: 4d408fa8b73ba30a95842d7ace87b927d638761b94e34fc57b6080e16cf9f448
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to various external websites, some hosted on compromised CMS platforms. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/15931111797.pdf In PDF document text
    • http://doktor-okonski.pl/uploadimg/file/74809620010.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/sinotiguzebifugidub.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/witirizuloviladex.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/bawone.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/2n63ihj1ik12a1ec25fph2pivn/gisilejexiz.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/77723387560.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/3183861139.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/72785561903.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/54760403486.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/kivawetirupepatuwi.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/runilunonugage.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/11219394544.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/44111076882.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/tagenoj.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b476d76b---zobekevege.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/duturabaronev.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/wuvivid.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/dizuzitusarepuga.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/01456ec127f4cfcb166637e4bb58c514/98907959481.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613450da58a5b---rigisepe.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/50948556582.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/60176630882.pdfPDF link annotation
    • http://ivankotov.ru/img/lib/file/pinadofa.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/72228732888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=get+any+android+game+rocket+leaguePDF 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_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 10892 bytes
SHA-256: f8b5d23636ed259e25aed3b61d8e6074c6873ed35f2e20713f73003104fdb529
font_02_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 17496 bytes
SHA-256: 40bb46df5cf6b8610547d7cd92620b8662a014d93791ea448461fbfa4ef62dc8