Malicious PDF — malware analysis report

Static analysis result for SHA-256 b567bf8bdcecc55b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-27 03:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc19b1dbc6c10613f3c84b39b5d2c970 SHA-1: 0dc7b1e0330c01facfc89fce324c17f7a5a5e70c SHA-256: b567bf8bdcecc55b97afb1dc9de64ff2a68dbff4f692f89642b019bb0fea7cc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to other PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious content. No scripts were extracted, but the presence of external URIs and compromised CMS upload links suggests a multi-stage attack or content distribution network.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=a+man+and+a+woman+2016+streaming PDF link annotation
    • https://orangerun.re/photo/files/soloridopasupewivurumore.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161385ce54337e---nirap.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/85886068782.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/83437878434.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/bukapawetovirok.pdfIn PDF document text
    • https://longhungphat.org/Images_upload/files/kumaburudegajatozasiv.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d91078855bb2ef58e6c015caebdfe18c/tegagisabozubekivenin.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/jifowojupusarud.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/dolibodenalutubamezoruxi.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/wukazufobuwibovap.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140be44af78e---83396818285.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/mumuz.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/48693263655.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210911_51C9D9A249A4119F.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/94591801981.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1111a07faaf6f3f8148582e80f723f33/10373150516.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/faliximigili.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/venivubatazenixekiruv.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/vonuwaser.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/86449949349.pdfIn PDF document text
    • http://jsdarvin.com/files/85782177324.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d219dcb4b2863be029ae2268d9af8407/xosimusup.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/tebidikatojusifasaf.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fodumisixaxi.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_off0000b557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB557 20176 bytes
SHA-256: 3165fc20212573da314ebee8b54932390db6344d5a61e8af64a48f8a936466f0
font_01_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 11072 bytes
SHA-256: c98640a18c804390eb26705e7079d06f58bda8d41ec65d796c130e11f558ca9f
font_02_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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