Malicious PDF — malware analysis report

Static analysis result for SHA-256 a833f3002e4b889b…

MALICIOUS

PDF

130.5 KB Created: 2021-08-01 12:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 57f4be60c513b4dcf7c10c7d612301d4 SHA-1: 8e9e12b5be7ae5e2146ecd3419a2b28a378f5e6b SHA-256: a833f3002e4b889b06f04e80f567fa66599e3bea6ef315b4142f06147753ae12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 https://pistant.ru/uplcv?utm_term=japanese+na+adjectives+list+pdf PDF link annotation
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c0609ff5e39ab8f2d8e5088977016598/68606009158.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b97e59494e66d1b84a285accdfddf698/maxofofuzijedaseji.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/509849.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6931a8011e551b7fbf62c6ed5598825c/karedusepajuzogerebobexi.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cb07e258961317676a78d8850db3b09b/nefafotefifo.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/ledifabax.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/66659828008.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/jasezilofamowiduxikolixo.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723c058cf9e---77758325885.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/sht4vkqecg7brfrgf7fumgtjon/36446746161.pdfIn PDF document text
    • http://licausi.it/userfiles/files/gisoneva.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/eebc44ba972697b9cb911a02ee4c6498/33168558581.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/nugiwiletamerunuwo.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/66345663215.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf54fe11338---44151974501.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829d759090f---41208619450.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/rogebaboxuwufimunudafu.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/tematob.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbef43240---37374523050.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/2660e491f297139f5a0e469e4cf11246/kagamunefof.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/romilegonajevuzusazuwis.pdfIn PDF document text
    • http://mopron.ru/upload/files/zifujavedokim.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 46968 bytes
SHA-256: d70056c017308622a92ce91aabc4d7cd267e76b9675c513624cc52d974bb6da6
font_01_sfnt_off00018182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18182 10580 bytes
SHA-256: 46653ab5e55c5f01c9646d71e47775c511763a9ce2c2922d370bd96c1748d6cd
font_02_sfnt_off000199c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199C4 19492 bytes
SHA-256: 36576eca0b292da09bec186bc6a6dea734bc601d7c9b611bdff840625ffc3a06
font_03_sfnt_off0001cae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2F2 16680 bytes
SHA-256: ce94197f2a6e91733eda25fecb71d9110dc99f00bc168d231d6ca96aac3515f9

Open this report in the interactive analyzer, or submit your own file for analysis.