Malicious PDF — malware analysis report

Static analysis result for SHA-256 7946fe999c99f369…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 23:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b8b0d91a631dc83d7207bab1fddb41f SHA-1: 7f5c94a24b76f52fd6f079b5f1a89fc7a08b8b17 SHA-256: 7946fe999c99f369157af427803fb1a033b36dab922a72ec69faa293a5092264
176 Risk Score

Malware Insights

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

The PDF employs a common screenshot lure technique, indicated by its small size and image-heavy nature, to entice users to click embedded links. Multiple heuristics confirm the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=how+to+put+your+phone+in+developer+mode PDF link annotation
    • http://hb-hospital.com/file_upload/fck_upfile/file/tadawimo.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/dugiwesujakizigisekevos.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/janizenudotuvopuz.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/37702100882.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/81588384955.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/xojavizir.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142787bbf4c0---125052045.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c21f67e64.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/10925810965.pdfIn PDF document text
    • http://hiniceshine.com/upload/67888258557.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/9c7845ca1b705443809ac07854551d13/jotegedilusopazafob.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/vufedewener.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/fabukotopatena.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/44351598535.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/61980783486.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/kixajidarovux.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/woleluzazepipon.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/79325961059.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14992293307.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/mosoxitujeti.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/debawijedod.pdfIn PDF document text
    • https://bawauang.com/contents/files/81952591863.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210901220926949502styvoi979gy6.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/65ac9b5e78845cf389cf49021c2e6006/dunojaxokovulede.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/79608330002.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_off0000b0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 14308 bytes
SHA-256: fc5c8428d3624ef736b64bc56cab59f84fdf663adcb3b5593fbd424dcbf57b62
font_02_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 10684 bytes
SHA-256: 5888deb5a63b2fc40651f509265ca61241937399032889ddbcbb28fd7781c5a2

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