Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58924ecaefc8468…

MALICIOUS

PDF

97.5 KB Created: 2021-08-17 08:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a20ef77af12f9deaaa37555d76eba24 SHA-1: 6e7cdf4e9c8b99164aeb972cdd72faefe1df06b1 SHA-256: d58924ecaefc8468fb5cd6e78f3874d8559ed598a8f8733f839664bb7ab36102
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the file is designed to act as a lure, redirecting users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://queure.ru/uplcv?utm_term=root+words+prefixes+and+suffixes+worksheets+3rd+grade PDF link annotation
    • http://baohanhranghm.com/upload/img/files/25723646028.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/gifikawewisaxedajawov.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5f0e0b45---42478655360.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89b583cec2---siwifenofolibudolosisu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1395791876c348b93a8ce578bfa345dd/45323639964.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/11605261002.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/54741264572.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607844983d731---rodulunapuzerizijos.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/vivobamojaj.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/pofinodoxejofukadofu.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/sowutumixepubeb.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/31315438517.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4c498fc77e31c92130903c11dd3aaf2d/30797728794.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cee812ff9---xuduwiboruzu.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/67029990714.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8466bc37b---karederojojovevemusowob.pdfIn PDF document text
    • http://arablift.net/userfiles/file/4889121804.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/vigikadamapoxevaliwabobum.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/33793015707.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/5201859109.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/nalirinisemipeke.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b42a473d07---82882308052.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/jatoveril.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8cb7092e---kimabegiwaje.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/31922828310.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/sorajo.pdfIn PDF document text
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/92888002588.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_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 11328 bytes
SHA-256: 0f0f03cefca2d990a46bcaffc7d839fe60c46e4cbfb7e2cb1936441ff7a3a919
font_01_sfnt_off00012cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCA 18904 bytes
SHA-256: c3493d5b73301b04f259acf4bdb34565f06b9dab166beb1999095ca46216da6f
font_02_sfnt_off00015f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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