Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f997d26919c170…

MALICIOUS

PDF

81.8 KB Created: 2021-08-21 06:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66ad554bcd929c7e8983f4496a45a4f6 SHA-1: bf426fcbce0a0b65f6a2d1068a4e44447b733a5a SHA-256: 86f997d26919c1705ac7bd15f17c07d93256d288fb688c0e17ee4cb1e28a2c19
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8959374c55ad36a664b865e58c32289b/vuviji.pdf In PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/demapizisokajafo.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607066c3d50a2---menufisizuwozi.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/52706482077.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088950ac6d1b---sodixivinirolixoxixado.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/2kh7ktks8l90mrojij9dhcbi1e/29992059212.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/60c7379025d0e3e2d0c02fb206f7fcc3/bozuderulabelokozuledufo.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/51053617324.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6e71d729---duvutotar.pdfIn PDF document text
    • https://wrd13.com/force/file/jizugowutemitak.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af90ebac788---61178136372.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f81b36c479fb0b0859344aba56c9ae79/nimulidimowurujodirelez.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3dbe4780---32515411833.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077022fc11f5---75308811076.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/40050726291.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097128ebf6fe---1837707736.pdfIn PDF document text
    • https://chpcentre.com/files/file/44551752604.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/fipukefix.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/tawojojozoromodadelaw.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca084b70b5---32805431635.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dcf55555a---bofuta.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607874077251d---39293788075.pdfIn PDF document text
    • http://goodwynva.com/clients/d/de/de91e19d235d8a3764238851c6b73f99/File/gitakemakeveleviborisuzus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+pressure+relief+on+resmed+airsense+10PDF 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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16188 bytes
SHA-256: c5eab72d94209437f381d316270d530b8be762b7e174a8fe6c0455cb824805de
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 11012 bytes
SHA-256: 6d3ce775679dfc9cf0b0081566ca1ff3e2a4764d9e9d9b6759eb22cec493e733

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