Malicious PDF — malware analysis report

Static analysis result for SHA-256 1498ac7b586510e9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-16 22:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51dd5dd78e708a10d6c33190cf827b3c SHA-1: 574a7f8719e09d72c492eb5fa6b6d2e1b662da2b SHA-256: 1498ac7b586510e9882868f3f9318138c1d16fe2d72c4a915ce2e06d93e14b5b
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, including one pointing to a raw IP address, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojanized PDF. The link farm and compromised CMS upload storage heuristics further support the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://gcoekmr.org/cukashmir/User_Files/imagefile/tiboripetifix.pdf In PDF document text
    • http://tiquital.com/documentos/file/zamivukovovofijulavovepu.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/94916248990.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/fepedenavu.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/risozepox.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/wasomopanibonepubuwe.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/nojeve.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210904_181201.pdfPDF link annotation
    • http://jfac.kr/ckfinder/userfiles/files/51632117069.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/db3dc557771948d0ec20bf3fedc89af3/banivobujigowowos.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2514799b63bd30d632b6e3883b1d8d3d/bokiba.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/98201980003.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/39988186358.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/lapilamisozuwumiburugeta.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/59556567448.pdfIn PDF document text
    • http://bastola.org/userfiles/file/73917571000.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/fopuru.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/tinusasojerolemezo.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/nelakifidopikivu.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/16293148472.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210904005957.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb200c4801---wositidebifunikapunaziniv.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/75695556544.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613927ef3d47e---saxenubugakadaxixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=biltong+recipe+book+pdfPDF 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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 18836 bytes
SHA-256: 7b7e8e46c7989f5a4d24e92688ecbbf8368216baa829d00beeccf3b74557779c
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10748 bytes
SHA-256: 95ab6a6b2e746f87cb5882a35c43c89f440f95a5a3ed813b1f9967350b2039cb
font_02_sfnt_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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