Malicious PDF — malware analysis report

Static analysis result for SHA-256 189c8ef975af0d37…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 03:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edb59d8cd7d7633f2d814f5f73f130f6 SHA-1: 97403c48b649b4c5f2286ba30981280c50cb1bea SHA-256: 189c8ef975af0d372edef7d82ff70e2b911b763c52ff4355308afb8e94ee1f5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs strongly indicate a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kibbkw.com/uploads/files/11323056760.pdf In PDF document text
    • http://abwsalisbury.com/uploads/files/74405247564.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/ketarezadixepodefoto.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/7538211865.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/3432079148.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/fujasunonavakidodup.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614736d74d2e6---12896259001.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/doromewewubepar.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc6849acb---59874613961.pdfIn PDF document text
    • http://potya.com/34933030763.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/kuxurufinidaferelovirumit.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/67091712563.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/vorokadilumifo.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/sewilitagojapaluziwazeru.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/45670dfa2bfac20b27a308d1679ee363/mofipovikudululufo.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/21649359730.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/15970471320.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/xaxoxoxoremawig.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/wanusimek.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/42771032429.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/37600264960.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/61633639023.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16142eec352e44---tuvadojesijavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=among+us+hack+mod+downloadPDF 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_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 10656 bytes
SHA-256: 039ee633509d4e3e5fe20fc3aa72512ccb3aede15144d4f18ff4c31206f91994
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 16792 bytes
SHA-256: ff6f9dee1a19d806199e67f2c9ad459237ef0f3d12fd067da5846bd486d94d03

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