Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28cf5cd0faa6a28…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 13:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b229b5b1f5141d6e73bc1bc2621a2999 SHA-1: 04a9930c3f185fedba674c2a780c77772d8f0ca1 SHA-256: a28cf5cd0faa6a2824da91804593dfb5b5187c4cbbcc36fd1f9053efc515d031
204 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a lure to execute commands via the clipboard, suggesting an attempt to download and execute a second-stage payload. The document also hosts numerous links to other PDF files, potentially part of a link farm for SEO poisoning or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • 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://wsm.hk/images/files/30570969053.pdf In PDF document text
    • http://pileshoppen.dk/userfiles/file/pufojujiwerogakukipomu.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/14117177989.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ba33ea93---disuvidupinuponesozorop.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/66213723952.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1d48bfc1---80229713843.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/56782770278.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/vurogilewifil.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zixebifigizekuturarore.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/movodexuzeziratudi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161382892e6a60---fuzixoj.pdfIn PDF document text
    • http://mutitar.com/user_img/files/narugukiluvaxul.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/97042156595.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefosinekalawopoguro.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/43b71aa5cdf0af20245640655f76e828/lonofiratemosiwuzupuwowes.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/vepedososalaxebuwogagogos.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/96186904380.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d1cb159e13f336658f7980d69a5cb8a8/18116104080.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/8879730393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=share+between+pc+and+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83686fb2f---65067821531.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_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 18080 bytes
SHA-256: 63bf980165c8e71a62fbd9310636843987b9adc6a6dc15f009bbcc664ed683ea
font_02_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 10700 bytes
SHA-256: b0a2e8907943fa550c524d68d50595e15831b09e85aa86076377c8b42fadf6e4

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