Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56f965ea1a11848…

MALICIOUS

PDF

76.5 KB Created: 2021-09-18 11:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef66e963a91f578cc3bf907743cf80df SHA-1: f26068094333aaaffbcd022582b0bc24e2e763c1 SHA-256: f56f965ea1a11848836c2c1525f56aa38b04ccc2feee8e0d9dc17f0c41fbc5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seikai.jp/free_images/files/96427192902.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7ecf2004a64d0649d2aa95a85170afac/47685094073.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/zijunalumofe.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/23220742026.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/56240035623.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/resetogopetulepiwamuv.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210907051259.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/zalimogunivinesupefite.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/16104881610.pdfIn PDF document text
    • https://mihalex.by/files/files/vidige.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/94724183027.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/34488427517.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/luwikajefazakemegejil.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/161369c367c274---51258900098.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/16980094762.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614309f2dda64---14078794197.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/18921760911.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/diwesowob.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/15489196594.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/botuwegofoxaroluvupigimob.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4bfaf405cd8cb16bd0c5ca92e280fb44/fasaliwunaf.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/tisagited.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/topisekaropo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=galaxy+s+beamPDF 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_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 10148 bytes
SHA-256: 8ea1b7792cb92435b2a82c361d395eef5b347035d7d1f7658750a7da3ebdd2eb
font_02_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 18732 bytes
SHA-256: 1695c5e6cfe72ee69b74fe1eab0616e35f13ef9385d29fa32dc7a31a9b74ec65