Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ada98539b6150c8…

MALICIOUS

PDF

77.1 KB Created: 2021-06-11 14:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 14d4da2e34f324f32a1b6993d3f0dd7b SHA-1: cd0728d3934cda9ebc3f3680a226737af65a96e6 SHA-256: 1ada98539b6150c8dc52d4c880ad57ff8ddd573b6ff168edb91940d8462855dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm designed to trick users into downloading software by posing as a driver download. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure to a phishing or malware distribution site. The presence of multiple URLs hosted on compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=mini+vci+j2534+driver+windows+10+64+bit+download PDF link annotation
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/58d96ce4a97370bccf4d249af52da627/73309215744.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9863c2a39c---81362422139.pdfIn PDF document text
    • http://axwelindia.com/uploads/mukipugub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ca915626---dowilesesajoda.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0addd314b5232a8a3f3ab49dac0dcc96/89548506787.pdfIn PDF document text
    • https://kildevangen.dk/files/webubovelolerepafoxadu.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/tulilepiridajemipabon.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/630cd56f9875a3b5f5dac4af6162251b/68963264778.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c03e1bdacef---44677195931.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/16dd4cd5ad9d44b1743799243fcaa9db/sezow.pdfIn PDF document text
    • https://mfdesign.hu/files/file/biwasavinavaz.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607941d739d0b---gavakasev.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/11d6d74ecdcf95bd7f84d71c9308b80f/rovetiduwabi.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/werojes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 6160 bytes
SHA-256: 8f1c572b45044deb99be5d4b635891f6fe606e153448dbd554ac8fd52f16b5d9
font_01_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 11244 bytes
SHA-256: b0692b5aeb083ba9f3fa048cf3969ff4a68c6b9c10a61d5f459d6c5e1aa366d7

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