Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ada59a8071ade11…

MALICIOUS

PDF

88.0 KB Created: 2021-08-11 07:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdf09d26a7802fc6e03eaa9099ba4afe SHA-1: f0e6a6cfb5d849ea29f433dc7685a311df2d06ee SHA-256: 1ada59a8071ade11415f57b98b2bcaba649719aeed46148ea262fe31a7edfd02
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The PDF's structure and the presence of numerous external links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b714e444f0---vitig.pdf In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a11dbb0e37---jaxup.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/h7djsidqrdjct4iooojr3ehpaf/75848154509.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/wasaka.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021060914553165778.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/44604765539.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b639faed1b1---bogodegawuresiwodowex.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/detabefawigik.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/buwopikugi.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/75898749137.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/jozuxipadoradudo.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/xuxutimerumopafujikuk.pdfIn PDF document text
    • http://biomisszio.hu/tmp/togezizusola.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/zunofirej.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be4816d81d8---wedudoka.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/gifagiva.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/22869490698.pdfIn PDF document text
    • https://cecprint.com/images/file/minikusepedikapovidatagil.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/bosuki.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4263f86fbccb1863a89e2ca8e8bd16ff/52814568081.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099da12bb27a---88554441191.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/6163093461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+zodiac+signs+compatibilityPDF 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_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 11036 bytes
SHA-256: bf8c56a88e61d8dfd563e5f49c4f8de535862a59b47a0472909edae9de83bf97
font_01_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 17304 bytes
SHA-256: d62d9c5f800a36ea494f3fc8d4ff5374dc7a40e751af5ce6e8ac602ea854df86

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