Malicious PDF — malware analysis report

Static analysis result for SHA-256 39409f1e63f2ef54…

MALICIOUS

PDF

117.1 KB Created: 2021-09-17 08:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2ab8d270e4768f5baa3660cb3d8ed8e7 SHA-1: 9afade71a8073904de231097a5565abfcc3e51f6 SHA-256: 39409f1e63f2ef5484dad9067461e9dd6427dd31caa453f51b0788ea1b216d6f
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 an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and embedded links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=ramtha+jesus+el+cristo+y+el+maestro+pdf PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0cc50cc8148e2e718b0ba05aeb0f2dbc/88653747786.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/xinogi.pdfIn PDF document text
    • http://birdwatching.sk/media/file/jasizonekefexo.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/dasisotosi.pdfIn PDF document text
    • https://jurad.eu/files/file/59659998989.pdfIn PDF document text
    • http://saydersan.com/firma/files/14063579370.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352d9767fcd---19982015717.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c5bba6dda---91428605918.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/18143687733.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219171248252303.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/66550062507.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/sisulunizopobekoz.pdfIn PDF document text
    • http://shopabrang.com/images/files/13421573711.pdfIn PDF document text
    • http://martonelektro.hu/files/file/jogupasuneso.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/lugajexenupowebaxaj.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/60597528115.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/87414293457.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a0c6672d---zovadedorewekixibag.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ff652fadce3772c54cdd2b45c8e0b4e0/42426045191.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/83052809251.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/bijesafemepis.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/sepukusimubome.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/24693752371.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/navuju.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_off000157c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C4 22620 bytes
SHA-256: 5e30d7b0171715eb20705b76621f74a556dd57538695849110f0dedd0b4c0fdd
font_01_sfnt_off0001925c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1925C 11172 bytes
SHA-256: cf9a600e0fb2741a73af84de4bbe87948f1e0e6ea3479e05217c12fc6e344a3b
font_02_sfnt_off0001ac7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.