Malicious PDF — malware analysis report

Static analysis result for SHA-256 f671b58f3aea0338…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 16:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e61fc3548bbb4753deac53a21eb908e4 SHA-1: 39ea97e878c8929bbf0eabebab83d314606904d1 SHA-256: f671b58f3aea033882234ab87527cf6080d02babe4acd497d0c692e6d623809c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting, suggests this PDF is designed to redirect users to malicious websites or download further payloads. The ClamAV detection name 'Pdf.Phishing.Trojan' further supports a phishing and trojan delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/7339554863.pdf In PDF document text
    • https://tonthephunglan.vn/upload/files/19298341640.pdfIn PDF document text
    • http://qdjshg.com/files/file/lagibavis.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/merubesufisiz.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8ce38885fc90680fe2fcd4e96064f894/5864175918.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/95379262544.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/34645210632.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/zawugiparodesifupek.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/49020942258.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05c5e88ba---59514962461.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/72909486840.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/la1shm17ca9cp8q6n6moblqlp1/rojejiwomagulekodebulabew.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dhi38memqk9sevq3r6t8s55i16/29960073801.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/tevatalasarogomi.pdfIn PDF document text
    • https://tekmaker.com/upload/files/98373577956.pdfIn PDF document text
    • http://turatabor.hu/media/tikodefivijalozojone.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/59804347117.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/98414664693.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6507e0cdcf71b3c13d31c49f98384674/mifejalakuti.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/71601810927.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/016e24c5c8498ba28ba9d30c490b2567/gijozojepinilegalirowuzus.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/17391169374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ibsen+a+doll%27s+house+pdfPDF 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_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 17576 bytes
SHA-256: 8e4104a3edb2d68026f3e4dc055d4add9ec36ecccfd6926a8b217c14009b1892
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 10532 bytes
SHA-256: a8acab4807bd4c9154eb0ee5d12871aab1c0debb0a8f227e0d9ac2de1da2d4a3

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