Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9b09b2b9328a3f…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 02:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2039526552684765aa464873ccb6e54c SHA-1: cdb943a9008f53e42c21d22fae20dec7716a7a3b SHA-256: 1e9b09b2b9328a3fbab3eb9fee5b71cd3f4ab2a006159cda5024464a05e2f7c5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through deceptive redirection, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=what+does+endorse+here+mean PDF link annotation
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714de9d320c---10718884147.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/82170511561.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076948aee8ef---zegag.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/mapijudamek.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106010549145401.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vjf5bi0sbbarir3e6dbga0mnf6/latugokupizog.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7861ec83e7---67786504937.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16268499393457.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff29b2db0---papuwenexezex.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/255cbf68a9b123acd9d85f38ea8cfc2f/xumavazovafaribani.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/49330c278372c874e896cd354c9b1148/jajedoni.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/lol9fr9i9sgs6869aic8dv70dg/36222617986.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed2d6918f---65503939428.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/73942865687.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74e2e41b4---26912399562.pdfIn PDF document text
    • https://susta.vn/userfiles/file/jolezogupobuwulosomodex.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b9c31aad0499c112a8aa679c823922fd/25528807042.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/8692759206.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bfdc1c715---56834132494.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94dcce4a9---54215168840.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161160c5050311---40430048532.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de086175c9---22911757699.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/sarofosif.pdfIn PDF document text
    • https://taperagi.com/contents//files/99633472352.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/45534203208.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6b102a6e2a6e2d5dd08f66125b5b6f4f/54621203293.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_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10368 bytes
SHA-256: e41ed20b257184a85cd8b39e5e8cc23f9a24ef21f92cc059f5261805ff4cae01
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13160 18180 bytes
SHA-256: 1fe28bf1ee5a4e84f16665bd1777808d5891184fe9b661c2c79d19cb18ade2db

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