Malicious PDF — malware analysis report

Static analysis result for SHA-256 beada20b5f019dbb…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 08:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7941e71ab6dc26a9fe6f731a622a92a9 SHA-1: 383681fb38ad9bd83a7407b3f736f3a5048d38e5 SHA-256: beada20b5f019dbba8cb60d5be62d57a87bdd4669c3eb3335fb20944aceaf06e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://ooo-kenk.ru/userfiles/file/95479269429.pdf In PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/jagoma.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/55411887795.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/50337104366.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/52106707116.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/71110098440.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/garuxefetisoro.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ce4bbbe57556e09b84ca560d5ff725ea/notifosawovu.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/80006909745.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/97187468492.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/mejoloxawibariw.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/99091834679.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/71fc9253913265972e4033d62bdf1cb8/dodexajapijuxana.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/tojisufofere.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/59941017772.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/54895982824.pdfIn PDF document text
    • http://myslizdrave.com/soubory/kolimixosavujerefuse.pdfIn PDF document text
    • https://music-group-store.com/upload/files/xofaj.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5c7b6b9f---julagivowovabo.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/70601640755.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/41745473583.pdfIn PDF document text
    • https://wasael.com/userfiles/file/dobik.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/61780420672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=whatsapp+for+non+android+nokia+phonesPDF 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_off0000b1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 17884 bytes
SHA-256: b9652bec4ccaaeb0f66523da2f4142880397847cebdae948cedd34fc89353481
font_01_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 10636 bytes
SHA-256: 085fc31a4e81b471e50ab6c2cc0e3cc55639b3f9c13c724cf1db116a7389dbac
font_02_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1