Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0b3844e30c16b3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-07 19:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19c48e09765edb74447a75fd1cb733c3 SHA-1: f7adcbb57de491e1e4bb75e199a38174798cfd67 SHA-256: bd0b3844e30c16b32ba8e584b07ae94d7875faa4289cecd329aa71dd59af6705
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body is unreadable, but the presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://misbahelmudii.org/ckfinder/userfiles/files/74855316272.pdf In PDF document text
    • http://satisfytech.com/ck/upload/files/dejixu.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/xozovokawasudokuju.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/gavarubejedalu.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/tufogojopufozulije.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e288b923---soxisaxelafoverebizu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bb2dcd99c---49506553795.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/1b0608c4f38608f7273cb4e80eb9dc43/kufawe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/234fa78b61764d6720e5dbf8da2c9d1b/nozubidodonulikitulupat.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90d30dac74---38060795782.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa7875a2e---xepegemipuguravubaxi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bphd15g6aftk234qsb7atm3vhh/54070798684.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/44705361025.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xogutusizeli.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalamarir.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/15656664546.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/20520267776.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1630732296.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48d989cbaf---82839042920.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7ae58deb6ecc78b7c170e095acdf7b52/27402301621.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/35954486539.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210709220223_j0lugw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=manual+de+pontiac+grand+am+1999+en+espa%C3%B1olPDF 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_off0000cfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC0 18584 bytes
SHA-256: 4b27c757b6eb2ab0227ae588b94186e58a59ad6c739e507cdb8477e4e1e49b5d
font_01_sfnt_off0000ff02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF02 11376 bytes
SHA-256: 3680beb4359fc63cb232e9c6662d78082cbbf7d2ce0cc524bab888ea35007082
font_02_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1