Malicious PDF — malware analysis report

Static analysis result for SHA-256 963405a9103e6b38…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 04:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6b36d534f686de83a4fb17b6b763883 SHA-1: 038381780a3073bc7380190cac5125ec312d15e8 SHA-256: 963405a9103e6b38135e504dc315f5297a799a38f18c34190ccf679a919eabfe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, flagged by heuristics, further indicates malicious intent, likely to execute further stages of an attack. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f05d7ab2---31487720590.pdf
    • http://fabrikando.com/cmsimple/images/file/jatuzef.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/sexazujofefas.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5ff20709a673de4e0aeda0461ba4e6f1/lijelipidivaduwi.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/dc0c221e97f72b50dd488fa7ec46f497/vuxarugosagutewi.pdf
    • http://elsekmont.eu/userfiles/file/89166831448.pdf
    • https://ms2gacor.com/contents/files/97703537872.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e355d1ca07a---67820758920.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf8cd468cb---vanuzavereg.pdf
    • http://elazentrale.de/images/uploaded/file/vewugurisatemetamojen.pdf
    • http://mikomisushi.com/uploads/files/vewexob.pdf
    • http://synergienetwork.net/userfiles/file/96911379538.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4d152023---12349540694.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a2cce8d2bd8b079641475e252a1d763a/pisaluxexomomani.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/7089192184.pdf
    • http://masterkontroll.hu/ckfinder/userfiles/files/79752276854.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/5oenumdu4mrnlbci5gg56ge5sa/21160832390.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hcjdnf2r5h2pksat7n0qb1ghpu/23690663493.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1fa26747---12840119562.pdf
    • http://bensonlandscape.com/editorData/file/xotatanematada.pdf
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/65175563484.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/hl0aoskbri1b4k3trjmf71cgr3/tixufefufep.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=maeve+binchy+tara+road+pdf
    • 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_off0000d621.bin
720d0eb706e3ce1cebd59046ebe436d391709703f6a14e69089ebd6517327042
pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 17776 bytes
font_01_sfnt_off000104a5.bin
067c3f11c368c60ebcd6e748383c613f121cd39e7df48080479306354337d008
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 10816 bytes
font_02_sfnt_off00011d62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 16792 bytes