Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64209d1e9f1ca65…

MALICIOUS

PDF

95.2 KB Created: 2021-06-27 11:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9013b2be0f216027ecd7984c2649acc2 SHA-1: 7555482b33217726ea2c0b3fa7ebc5f60674d137 SHA-256: f64209d1e9f1ca6588db98a9dc0b96be34c99057b942658e65d106ce13c4c523
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The primary attack pattern appears to be directing users to malicious or phishing sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=training+for+warriors+pdf PDF link annotation
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7so70nt6t65316snhdajmene72/bezek.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa2683ac8---notomifilolijok.pdfIn PDF document text
    • https://mattress-leader.com/media/damulinotelonesoworef.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/rexizenisenekeres.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b6e1a6eb28ef8e2a4fe4a608629f2f84/12993754868.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zowibowosesugubapix.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d435bae8c9---dadefexiforasixig.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070133cd7e87---kojuzawovakuvibefikumakes.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/6045556878.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/baratigelafifovarimo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609157c7a1967---sejati.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/dcc2929c236a4603733bf9ddf58edddb/neravutekuziwejivuduk.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160776bc56e872---72055725642.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kaxodijozog.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/91d0086104163ce7184cd2eb8647d60b/96543540651.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/sotoj.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210606_134614.pdfIn PDF document text
    • https://senfina.top/uploads/files/zabanokik.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bef60132d09---73572725137.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/41731376485.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/34f14849260842bd1464a542c61e30f1/29676482608.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071df1a2e5d2---xesumebatavos.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fc36ceb4---sofejiwubemop.pdfIn PDF document text
    • http://imaginove.eu/data/Files/40492064113.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_off000110a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A3 18000 bytes
SHA-256: 5494197703be13db5a96753ed064fd9819b4493e0c620725e08738d6f9f0eef6
font_01_sfnt_off00013fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15805 10448 bytes
SHA-256: d68d1e39600c99c3d844149dc7beb3b896f34ee48b4aa34be9ea11eff69bebe3