Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b949dda4e4ed4e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-06 02:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dea310715f977bbee241f3e6c9d74cfa SHA-1: d75b0ce62be6c38bd187b8433fb8cb6df5fbfc5a SHA-256: 35b949dda4e4ed4e83ea8c72c74472550e65bde15974897d93950e10f0029d42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search results or host phishing content. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common method for initiating malicious actions within PDFs. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=utah+medicaid+application+pdf PDF link annotation
    • http://tlxzkj.com/uploads/file/151519165839.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/filironobusoladutix.pdfIn PDF document text
    • http://geotersrl.it/file/80458683158.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee817874d---mizojabo.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/gagenowilexuropaf.pdfIn PDF document text
    • http://ccshecea.org/upload/files/jituxerom.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088041a691e1---wekiziboja.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ff3tf54v7bgmj53c28ir1qi435/55988352512.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/60560880261.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae91e770f03---kubozubedubidatos.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1c04a0960b8da4e170aa0172b8a449ca/73596902799.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/zotezagoji.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/95342876897.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/wugonozinepotevimu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d59a72f7f6f6eedb9651858da4b68016/55834002518.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7f9c16a5---pewezikaxakutifimujalafaf.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/46754339477.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/17193023046.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/1540244981.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b1b7d011---zijajuguparonojagujoveta.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/91467442556.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/70681733247.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/lanusonekurenufixav.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_off0000b2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F5 15548 bytes
SHA-256: cf6ea93d2e216f88c00a02431820aab1b8686f13be6c01987a57636582236924
font_01_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 10624 bytes
SHA-256: 06c5ef0959fe99293a9d70994db3dcae4c5907b3c9a7e4787e934d378f6f60b9

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