Malicious PDF — malware analysis report

Static analysis result for SHA-256 b409994727c95a2e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 02:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4595f71b31761505c4063a0851d4506 SHA-1: 35eef184d56be115a9bc46568964d95ad5408816 SHA-256: b409994727c95a2ea6a4013e821a70abad5a91f18c05f85bc41bb0d3069d178b
224 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external links, many pointing to compromised websites or disposable hosting. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document likely attempts to trick users into revealing sensitive recovery information. The embedded JavaScript and link farm suggest an attempt to download and execute a second-stage payload, likely a phishing or credential-stealing tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://resttour.com/images/userfiles/files/gabaroxelekutuda.pdf In PDF document text
    • http://lauraestetica.com/userfiles/files/64673937354.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/pudogoralizunetedorapox.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/putufasitemiziwogeg.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/08ec5f711523d68a8cc264959f921b24/nulav.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/vadizul.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/73458524582.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf175aa4c7---88731623021.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/13160568465.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/vinuzitizo.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/13026264256.pdfIn PDF document text
    • https://successalpha.team/upload/files/jozuwozejadap.pdfIn PDF document text
    • http://hueide.com/upload/files/36007602000.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/nimejilotesaki.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/tikosifemanorisenumat.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/rusizo.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/20447392711.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/73963016980.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/dovarujazixe.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/24297278478.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/45261771855.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/61468605546.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/tekuwikolonamo.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/3428377483.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/virosakuredezafufasudosim.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/vanemepijoravo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161361d3a45dc1---62613647594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adobe+flash+apk+downloadPDF 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_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 10604 bytes
SHA-256: 6d53507865a02efa4af2d0cfe1f3b60c23b1204d26e9d936eb11dd9752c707ec
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 17340 bytes
SHA-256: bf07f04bdd911eb804b85377facc90caf8e1cb2844c2e19f17274894d9f2289a