Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead8e7e4d01a5460…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 11:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32d507df0780e626666f7fbbcf84ed61 SHA-1: e2a4134dada1e828cb765752ce3431a49081b229 SHA-256: ead8e7e4d01a54605bef31eb4a0a224fa0e782d25a0ee1b3c4bd07d48e0353e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://wastran.ru/uplcv?utm_term=poweramp+apk+2021 PDF link annotation
    • https://jpjplumbingandheating.com/FCKeditor/file/71253807882.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/5251807571.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631579728.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/65128855337.pdfIn PDF document text
    • https://hinaweb.com/upload/file/zaxulikamarevexem.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613685bf4b4ee---juluvipipubebomirazivag.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/367298686.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kesatogumuv.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613305626028b---74970697529.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/36878415187.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/sudemamujuwejuvabasoxipuf.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/sulamar.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9ffe116a56c17ad1e26242a2795880ee/lukekupenatipapuxoxu.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/86249855969.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/sakega.pdfIn PDF document text
    • http://pronobile.de/catalog/file/bopisam.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/15992811108.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/13735426334.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/49756409338.pdfIn PDF document text
    • http://dakov.hu/_user/file/lulurenanovamit.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/46817431840.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/41649742500.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/22803021929.pdfIn PDF document text
    • http://greenbrier101.com/userimages/86437132944.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/vekesetavesiva.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://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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 19228 bytes
SHA-256: 7edc266244c6461e5a0ca44dee3fe42d1221e50a028540985a0b91d2980b5442
font_01_sfnt_off000113d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D1 10380 bytes
SHA-256: 7f82c83fcf5b3b138f2ba6b76b9e74f9c64d2941facb59128fe84c43dda0855c
font_02_sfnt_off00012b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1