Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c787a018f97a2b…

MALICIOUS

PDF

137.0 KB Created: 2021-08-09 03:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b7a452aac034769e8e88582f27cbcd3 SHA-1: aacb3a9587c646a2dc1e78bd64724552ba5bb6a9 SHA-256: 18c787a018f97a2b95c10307f29b39ea381938d398e52fff1491bf69caf3cc98
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://philabc.ru/uplcv?utm_term=estudio+biblico+del+libro+de+romanos+pdf PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161106be414f56---zosozapopud.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/josikilogigutamega.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/83751329feb7f01dd342be2390a885bc/90592149753.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d07acddad---kulazuwubilikaz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5a480c5fc---budamoxivuxoni.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ab1a80703514323923f10c27f79c55cf/92083244435.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/19ce069e97154a2b23054b76d5c5bc5b/tugulajomuferododume.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/92672066567.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/fuwiluxijenakojamemo.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/vimuvuzivapodetaxixisapa.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/50690831522.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160df43797d2fe---94500914553.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///negibowa.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/5632032877.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cfc2f427b6---risarejabajopifaroriferej.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/kinorubaxutenobis.pdfIn PDF document text
    • http://bwc.lt/i/99963665154.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/51936227598.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f9f433e0ac19f3c06129ac6e62a2df3b/7322862819.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/dugigupujupigadi.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/pemididimawuvu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/64108300172.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/96668974362.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/jegajuwisuwe.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_off0001b569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B569 17364 bytes
SHA-256: 3827410b4061b1904c6c276d5c18bf4c8286b4b150f7d2a816be5ee15f082b22
font_01_sfnt_off0001e17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E17F 11004 bytes
SHA-256: 8fc1ba400d6111b25e97a1833b3519207723fe5a2c3c8766935c0e8217eb7385
font_02_sfnt_off0001fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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