Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a7bcb1a63c651d…

MALICIOUS

PDF

93.2 KB Created: 2021-06-27 01:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87e728ca2741be2c07f82d0059feecfa SHA-1: 80a4c6abcb2939a609c693f3a56c9da17e4e479e SHA-256: d1a7bcb1a63c651dbb527eafc67deabc4cb314526ca005d50d25b559b903a2ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to external sites that host other PDF files. Heuristics indicate this is a link farm on disposable hosting and potentially compromised CMS uploads. ClamAV detection and ML classification confirm maliciousness, suggesting the primary purpose is to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://win-sonic.com/kida2018/ck_imgs/files/55885955272.pdf
    • http://zwickerfoto.hu/_user/file/4073647673.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bae855dd408---26380901230.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c075dfedb39---47856661122.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/8jlgft9le3vpe1sjh1aubq6tsc/neguraxisutetabisab.pdf
    • http://group-anons.ru/userfiles/files/14798027812.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e389a1e9a---66456944118.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/guturelorutufekekafem.pdf
    • http://www.peretprod.ro/content-images/file/89628515003.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5e06478a---98663840307.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0eb9ebe6---jimuwezudisizarenowe.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f4a6f1df---20138419339.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd5ac5edb147038113aa371f5b015097/66085379536.pdf
    • https://residenciasanamaro.es/userfiles/files/28578569030.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/03e30f618dab4d8d8d8ca21bce8b0116/79948937286.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/m37pskrkmfmrec9vpk9es74los/kugifosugasinojatuxuke.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa519d43591---36845038984.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a442ce0250---tepojetukap.pdf
    • http://dancedynamicsla.com/clients/38740/File/jelixoluvisigegotuzupi.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16087e0fe5495c---95975882823.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b653c4d1cb0---tidedetujuzodukaved.pdf
    • http://ccswcd.com/userfiles/file/6086024609.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/jakepf4t9phdagcp7qc2rjuebj/10270628567.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5735db26---76284618867.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sagewood+manor+houses+for+sale
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 16792 bytes
font_01_sfnt_off00011c8b.bin
aaa75e9427b0a8dbd00bef46f551fd50b9728de91af95d35bc64281a4d4f0673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 10872 bytes
font_02_sfnt_off00013540.bin
5c5d05edb9648238da169c30d156a2f0c03e1ab58e37a743eb6f6d5475e6b46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 18724 bytes

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