Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2839003fe7fea3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 00:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1026e2dacf99290dd4e885dd63c0fbc5 SHA-1: f6eb1ba00474fce1b4f1a86bdececc51f62cca10 SHA-256: dd2839003fe7fea31c2a3bbf95788c0182c2d6264db4a64ed23fd42a37276d23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://skene.es/userfiles/file/76179245334.pdf In PDF document text
    • http://mutamobilya.com/images_upload/files/6216156254.pdfIn PDF document text
    • https://miet.hu/kepek/bakobes.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/acb7feaaf418088b2094518143073fa9/gokeweraxol.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/78696119270.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/puvetawunajid.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5658f0c48---42528544680.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc5e6da68---miruxi.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/4219327615.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/2397717769.pdfIn PDF document text
    • http://change4best.ru/upload/file/todojur.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/difenarosanusumamiborari.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q9rutfgbq2q38vpcafccbukvk0/78584745824.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/wulugi.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/97392354755.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/30263480591.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/xinunakejuzegutup.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/88189458801.pdfIn PDF document text
    • https://protrialse.eu/files/files/notawuwusepinapewozis.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/jakugixujuvefuxujizuzav.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dukoxisadisuberaka.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613540d226835---20881799332.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/wumulote.pdfIn PDF document text
    • http://zaiger.ru/img/file/kumeragutevozanagipebaku.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/28256855755.pdfIn PDF document text
    • http://warehousetraining.ie/images/tonesibubusu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021918556496627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=chromecast+applications+for+androidPDF 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_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 18268 bytes
SHA-256: 9f833b53352926c30093516a86b898b29828b447c9fd9c82ee4917fcf7f66159
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 10916 bytes
SHA-256: 81c23e51abe9d747335c939ca8d3edf19facba419b0614d12bbbca80e1c94d59