Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac9d434a800b3c4…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 11:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f11ecbce34fdccb2e6e008737539e01f SHA-1: 85e15cca6daf2387a30b4c5b595eaa3537789b11 SHA-256: 0ac9d434a800b3c455d0824dc331fdc209537fc3358049822319d48e4e1205e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://schodylux.pl/userfiles/file/vopuviwi.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/fofokuwam.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad7164a0a---makovuwumisazidunutezituk.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6383d96d96636383a4051f2cda268449/26942950983.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9dd9d5702fe2890bc6649cfeb0a130f3/84583227834.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59365991213.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/m271b92vjua1q7gtlkm22e9cpk/kinusebit.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210522090316.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29c07c9f23---vedanev.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4f792b8d---40632966155.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/mumitipulinapofuwatos.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/37235309533.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9596577398ffba26db1acf74e7eb37c6/73195699372.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/vodonatepibafafebef.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98163d89a---16183765728.pdfIn PDF document text
    • http://aps-mes.com/files/file/wixuvezokezujasamalo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1937dd075---27332834995.pdfIn PDF document text
    • https://jagominum.com/contents//files/kirulabamegasefoxudikiz.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/c302b9a9f0a49fcb3fbfb315022ca7d5/livekavelirepizevukub.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c5835651d355e653fa3f83f3e273dabc/xedubakaje.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/52963710253.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/52567936226.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160714660e4361---26358453131.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098970d326ee---70517945848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pain+across+upper+back+after+eatingPDF 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_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 16512 bytes
SHA-256: ef945d0de944242873837c65cfc3c41f79731c1b78385700b0ded71db82cb82f
font_01_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 10944 bytes
SHA-256: a664845409c2bd09a3bbdf51f65f6cb2ec29a034dcb504750aaf6ecab8c3fe4e
font_02_sfnt_off00012ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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