Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4214ca8e7d760f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 01:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ec4e7274a59950ec8fd273a1e9c74c2 SHA-1: 4713e0479a6fe51f26d9b9855a1ad4b623e31d7e SHA-256: 9f4214ca8e7d760f33b6e9b0b2bad5eae7bb9b2a9996b778849a274b4a4e1988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://smidgel.ru/uplcv?utm_term=aplikasi+yang+tersembunyi+di+android PDF link annotation
    • http://elitacasa.it/images/file/55331029131.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/71418640186.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/11658979274.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/47857485142.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fa6c0f22---99381134629.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/wuxojojawu.pdfIn PDF document text
    • http://synphabase.ch/upload/file/julakitowel.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/36977703915.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/24345469795.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613428751b053---vepafabupufa.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/51621127080.pdfIn PDF document text
    • http://biosite.ru/images/news/file/68577835059.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e181c5a8ed---6271292266.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/rosesexefobowovul.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/68347286788.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/jonokanezipakapetabinimuk.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/10199191239.pdfIn PDF document text
    • https://finliz.lt/i/File/nejixejomerodelop.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109091816557371.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/32532204433.pdfIn PDF document text
    • http://www.ezmoving.com/file/41024152009.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/faxarusine.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/84103714319.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/vobit.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/47095168297.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_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 16264 bytes
SHA-256: 51b66b26494272745ac6f12eaf254499b188fb7a33e351ba061f0bdc881cd5bc
font_02_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 11164 bytes
SHA-256: c862beb677ba4e4e60495345fc1509bea05d79f3c24ca8a4451ce70c5a83c152