Malicious PDF — malware analysis report

Static analysis result for SHA-256 05735db06f9937e6…

MALICIOUS

PDF

87.0 KB Created: 2021-09-04 03:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53b10d389177c1c73c48e7fd29599da3 SHA-1: 4683759181cb6b946c2801eca85334ea0e9df405 SHA-256: 05735db06f9937e617f947677c19931b680eb9d73c9ffc35a5dddc9cf157425c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8d1dc8570be3202eff2bfbb798e028d1/68845063907.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1d2abd922bea16c9ed78a6ccb53450df/gevizoliwifovafopamelux.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/46986659199.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/xidijinop.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/86786119906.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8bd3a23910f9e08f345ed839c0df0be9/givorapomuta.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/84d90fa4e5b81bd7d9da315c5a080f1d/32197643417.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/93640630220.pdfIn PDF document text
    • http://alkanboya.com/files/file///xerej.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094587fd7738---61669508120.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/lazapidekesajoxuve.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/3ddd5e5086f9bf6406b2662f4c0e8caf/tigezipukivu.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/pewixufodakupiv.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/77967625278.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/84530072432.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/semome.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/banuvoxafuf.pdfIn PDF document text
    • http://zerosquareonline.com/file/80350973984.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/61299292.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/42ec8c8b877a5ba5c4a6407ed4d6e6a0/livotigutavanozekatilixor.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/bagaluxet.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161038e58e54d4---49969500741.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/31bb88b67100c7eab8a8a888d352b052/13902688276.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/27188816144.pdfIn PDF document text
    • http://santeh.md/img/files/86634393936.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/linavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=savage+worlds+rpg+system+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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 10988 bytes
SHA-256: d90b85568e1670cfe68cccef2a0ac33af767b8509481f74b44109de536c0d6ed
font_02_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 17092 bytes
SHA-256: 94fc80f6a2fa6c8265eb50ce6dd94c41ae6ed5efde10a00e56099b48b54e8831