Malicious PDF — malware analysis report

Static analysis result for SHA-256 524dbdf0a0265beb…

MALICIOUS

PDF

77.3 KB Created: 2021-09-06 18:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73ead34b1b4a015a30de43973f864d12 SHA-1: 9cf2fe582c4671f89d338be2a39636dfb5a26ff1 SHA-256: 524dbdf0a0265bebf8ab269ffb337b656ac68002d52d1726aa10e343d1b30de8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links further supports this, suggesting an attempt to leverage legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://metabolizmusonline.hu/images/upload/file/lefapekuvebixami.pdf In PDF document text
    • http://mobilesamara.com/img/files/file/47452283532.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/24220588266.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4fc8ab7fcf22e56b8deb26144d7bb25e/32295986354.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/29b4be46053d4c4643bce904f7e07ec7/miroxoduzokexiwamowegew.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/63425144807.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/vepirirudib.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/65843214096.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/jawozagukalurawifir.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/nozivugavotapujamo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aed850be891---xukobefisumo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/49864326234.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0dd4184ae---sunugutitemo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/d3d2s5bqvcnot8bg317guoucfp/mozosogijurez.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/vinuminebevavawasekozo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bac8761a5---lerogesededujolorujelaxi.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/97186048705.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/81018873257.pdfIn PDF document text
    • http://119pump.net/d/files/vataxasilosevi.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f66c7be3883cd5f7447108d52f04b516/16053787174.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/48634291130.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/ralojukonuroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=yuddha+kanda+ramayana+pdfPDF 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_off0000cd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8D 16748 bytes
SHA-256: d11135598f04094f96e3567c73fc077618a9b391d88d31474029a9a6e3b732c9
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 10396 bytes
SHA-256: 5f0bb83338ff3811f7efb9449ce775968e331dd8f8c1db533cbbab0b8f766586

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