Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e338de1401d556…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 08:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb186a1a6b39dc07256e4e492d4ac7c0 SHA-1: 86c9944ea240d595a44e66578674f1bf6500bacb SHA-256: 99e338de1401d556e3a38574eb5f65c500ff250bd12aa9dde8d0f0ee818f9add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is a PDF containing multiple URLs pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. The presence of multiple compromised CMS upload links suggests a pattern of hosting malicious content on vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/550ceab1643bcbed9fc272811c95fd5d/14580634982.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d27cd709d---56155185495.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/33940325064.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/xobumavewaruwuwoluvomuw.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/nd30n4gmpvgh21gfvr5hclu8jh/giluk.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/lisedodaladaso.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/48292375282.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/3959861046.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075167fe6210---49440092792.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/74c0ca3b97201fd83a4efa433f9bcb19/mazulol.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607470d5e9609---femugiw.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents//files/33080997833.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/38231056172.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/36923572735.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/jotelobul.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/78238673297.pdfIn PDF document text
    • https://yuss.it/file/77075945715.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/5925e477f7796ae4da9580f3c375d2a0/45852670090.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4268bd38dc---89836216333.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/33662826367.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9e1a0d5239660f29a182a50306571220/xuletopirexafoboge.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a09e1d705e---ramijo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/28484010178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chapter+19+lab+using+index+fossils+answersPDF 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_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 16852 bytes
SHA-256: 51f169fb96399cfa785644bad4f36ada9be6787a10f00dfe02a2980b5d5d8379
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4D 11456 bytes
SHA-256: 3ff7f4eed89215e1c7f67fee7af62a07d86a57b1b71d28d8626d9121abbda978

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