Malicious PDF — malware analysis report

Static analysis result for SHA-256 e968f6de45d2d706…

MALICIOUS

PDF

69.6 KB Created: 2021-09-03 18:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a421f66e496b1968d24ef2cb4f06333f SHA-1: 4062777dac7a404b870869c6618c2fc59cda6c81 SHA-256: e968f6de45d2d706e0314176b8ca5312fd2c1ec5198d1d3b0e1f0f30c650287d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites and disposable hosting. This suggests the document is designed as a link farm to redirect users to malicious content, likely phishing pages or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1624533046.pdf In PDF document text
    • https://aldwalia.com/userfiles/files/suveriserarar.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada156a752---57390030025.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a80141067c7f07529866729f1427341b/vifavemunubomewonutunuje.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/sidivi.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lutexirelixikopo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a445844c1a3---zujipimujiruvepo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d0bc2b4be---kobave.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb21d4691---45124717758.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/110c2a1070dbfa861eb920db9696f76a/juwigumavivurupiduwipar.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b7481fc1f036cd694424776502102966/12578881930.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44161b8ec8---furig.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/24f46daa501b9260588bc41815c6a247/bibuvosofisazemato.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/7705737284.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/73191436918.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/fukenalineluxexefoguzu.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/50822711223.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/61634982625.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd1203319---xirurizik.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/36508965507.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/k5nupcm7s164avifdhitump5c6/95510380430.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f54f192f9f---gumedebojabor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=money+worksheet+for+grade+2+cbsePDF link annotation
    • 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_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 14316 bytes
SHA-256: 5d9fba0de496035b77990a5b54c3c30474ede7785e55a35adba8f043709221df
font_01_sfnt_off0000d6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 11164 bytes
SHA-256: 71a047032ed0359f3e79fec89b7c77879e19bc9c021b9db05e56d1b2e6297c17

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