Malicious PDF — malware analysis report

Static analysis result for SHA-256 66400b65ddf593cc…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 20:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb5f39423aa130c8b79fcbffa829dadf SHA-1: 61ec2c33b464c5c7a51ec961b07db53dada55bdb SHA-256: 66400b65ddf593cc677729b2d383ad088ca9a140e5ce42f141b2bd8b9f8f6f6d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier. A critical heuristic indicates a lure to execute commands via the clipboard, suggesting the document is designed to trick users into running malicious code. Numerous URLs are present, including one pointing to a compromised WordPress upload directory, indicating a potential distribution or payload hosting mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://pixomot.ru/uplcv?utm_term=minecraft+java+hack PDF link annotation
    • http://bet-balance.com/userfiles/file/58654000040.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/murexijojudexepafukovova.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/61061107876.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/kojudijufapimufawatanom.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/defelusimonosob.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b686b8bc---jikuwoselemedekorod.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vunigegoluvazox.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/27824997774.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///kerexerukawavizigoja.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6ddc1eca40a2468047753bde6d4f06cc/25903133843.pdfIn PDF document text
    • https://akvaguru.hu/user/file/24421997301.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/mufuxemufum.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/kigut.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/zixumu.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/mifepowe.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/94043065044.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a41733a7---96003965422.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/daseguponaxodarizisev.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/43821876714.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/54985082427.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109161027199644.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/zivovorural.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/zapot.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/rugabawiv.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f495fdb19c---bovizezuxozapibot.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_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF881 17564 bytes
SHA-256: 441f874d66547ae685e65fc52b732a1a69b16bd22e6d8f9461eead2c288c7402
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 10380 bytes
SHA-256: d46a1a01a84c19ddcfc904e71d7653453e5a4f4aa94222db382d271ef612f218