Malicious PDF — malware analysis report

Static analysis result for SHA-256 1789b75721f72cd6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 08:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7fc38aee5a6ee16be2e9ad4fa15a9b5c SHA-1: 32246544e0303069b6e9ba8d201d5a2561ed52ff SHA-256: 1789b75721f72cd67357386804d27c80f636758272d40dd01b8cad4eec3d0a01
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing campaign aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://flambotour.it/themes/userfiles//files/sigeral.pdf In PDF document text
    • http://iglozawiercie.pl/zdjecia/file/dogifigawuluwemavano.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54a8315d7---bogadotekimetex.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/zaxexupat.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455a726985---86216178942.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/selaxekosomivazodilabixe.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/losowun.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tusijalu.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/110911149978.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/uldpd9fh7km9rtvlsajnlntk07/jilalefegivemalovu.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/fimobuvu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c12d3892ea8aa7d2855f3cbdc862ce30/37488836829.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/4799767755.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/liresivu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/35085612399.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///mifedinidorifovodi.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/63209058127.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/93655344032.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/toladefoso.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f01179eaf6---zogiroverunuxelosadosorib.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0611538a129d5dd6f2b2252809d61b79/89744446536.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a873cd88a62---tokiwuzuwe.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16073236e8aff9---lusepejevig.pdfIn PDF document text
    • https://mmszke.hu/files/file/sugiviloxeb.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/pajutapusumipewig.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/64099988927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mechanism+of+phonation+pdfPDF 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_off0000d054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD054 10732 bytes
SHA-256: 81ff4202ff540cba42070029cb78af6beea419f04ea359f7ea7807ea2db4c61a
font_01_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 20564 bytes
SHA-256: ad5eeae4ef277ce7c31ebdfed4bd2cd40e6ff54f51d392d994b93a678d86bc48
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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