Malicious PDF — malware analysis report

Static analysis result for SHA-256 692f136f77a3e536…

MALICIOUS

PDF

103.2 KB Created: 2021-08-19 11:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62a6e0a74ecdf4308bf8e00945aa39e4 SHA-1: b01535cc1b3ea27cc64e1fa67778f2dffce664fd SHA-256: 692f136f77a3e536b1e71a667551f277b96ac4a2eaecec7febdf273702595974
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with several URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristic firings suggest the primary function is to host and redirect to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e78701715---80861617299.pdf In PDF document text
    • http://viviapalermo.com/userfiles/files/gutebilagezufonaje.pdfIn PDF document text
    • http://fitviewer.de/files/file/29557967884.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/1b4abe8588061b8c33c2054127b7f601/surejug.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/99261658366.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/09447cb50ed09a9f0e74a9e9c6929f26/meganazuzudowizixavalidaj.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/90845138008.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161084c4d17256---jaxavugujedon.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddbc2e383---66024811134.pdfIn PDF document text
    • https://avflash.nl/upload/files/27812443907.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/zepitixaluzit.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/wopekagawoneputalovo.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/wupemu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607700e6035db---37487458540.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/93132484741.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611abaada804b---zemof.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160d3afbe0d7c6---wodavumal.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5ad2ba2c3eb333f0f3933bd3c4b4d28d/jujoxefisofodiroxo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503214851_2101201986.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1625694227741.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/bazuxopid.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/81542210418.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff1c1be79---jularurofapila.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a4f0dcde246422f8fde375a8305cb93e/38129629105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ejercicios+de+enlace+ionico+resueltos+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_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001432d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432D 10828 bytes
SHA-256: 9ded5fc61fca7da26938721cb098fca6bc6343dc9bbc071a74e64e6fcd52f178
font_02_sfnt_off00015c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C37 18868 bytes
SHA-256: 62d86379421dd73076c7152365732266ee0768c65512591e83d318d6fe18c218

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