Malicious PDF — malware analysis report

Static analysis result for SHA-256 9145174d307e95b8…

MALICIOUS

PDF

108.7 KB Created: 2021-07-13 08:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aed11f625298a0f54d44f0bbf47eb6b7 SHA-1: 8589e71a0fe44dc99d5d57b4134ec39ad57c4c75 SHA-256: 9145174d307e95b88832476f37193e7ee5909f66ef0df8b7ea2c6532d1dad8e1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF as malicious with high confidence. The presence of these links suggests an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 5

  • 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://smartvoicecom.com/userfiles/70449324171.pdf In PDF document text
    • http://splogservice.ru/content/file/15482150312.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fikubawibedukaperarem.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/5030406972.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/muxototilupewan.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/37676224714.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f3fe7bd55e7058ba780382f388a77b92/vevowubeber.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0be5332daf28e17df988e3af6c157370/25312510855.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/nedoludesu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d636d832872---zexiwasegujuxifowodazozib.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/85032b7e855767b04a2591fd47cbf991/wabuzagasosepafovugipa.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/tijewivukosagurogilatu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906be94ea1f---wujonodugizekuxuvuleg.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ea558477e---nigaweluxozolutapigob.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/jokusasaniluzozavukogom.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/hiv46tftq9memrdgjlb04uta4t/44353797361.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/18597823755.pdfIn PDF document text
    • http://agavietnam.com/img/files/monajo.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/poxivifipikot.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c004e7dd---67357787985.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c26a07dad0c---97538854948.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/63181784792.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2f1c248c---vuwenal.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/31944935693.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/linobixopifesavaluxuv.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/sqii70tl7fplg8tid3mf745s36/57027409921.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4665b13d50---34574075813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chemical+properties+of+acidsPDF 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_off00014147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15959 19036 bytes
SHA-256: ea2ce1f188aeb664eb33e6bcdfe3a895621e82e18d8f4e30f6711db55d94d615
font_02_sfnt_off00018c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C52 10812 bytes
SHA-256: f7d37e1ea09bd72dcf4331028386c077352f2028290e76c62f09729ab2cb671e