Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb007eb0aaf7ce54…

MALICIOUS

PDF

87.8 KB Created: 2021-09-16 04:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 18a3704c402d25e3e5002120b2b2ad22 SHA-1: 43b27724a88b9c54240f403b5c3c07f20a9fe91a SHA-256: bb007eb0aaf7ce54000b9e9ead79b5b94370cbbdfadb8c0cfaa21a5b30af1a7c
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 WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/75bm1kpfmnms6hkp460vqnpr1m/4792852942.pdf In PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/sivuwiwi.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d69bed27---dukidelegopidoxodolujorok.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/boxepenamalofeju.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zedalatat.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/fefidunerutotiwaro.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/74307532692.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/nifasiwogasokijuraxumobuj.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/seneberisopimogevix.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/zopezi.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/nazusoronilezitubodasape.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/84349251528.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161428c822310d---46682212099.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/12597116464.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140f96a6a758---butiwurokoxegulovabezug.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/bepejidepebozavibi.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/31778962787.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/fanud.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/59666866759.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/wawowekutefonarujebu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161395913213a7---84776050462.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/63678616430.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/lavegolibuvomek.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/93700252669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=print+awareness+lesson+plansPDF 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_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 18176 bytes
SHA-256: 79aea21b0f6562c0a2c78f79df677fefd3c9d635fa64064cebda4c46780fe972
font_01_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 10332 bytes
SHA-256: 5fe38fced2c5876d207331dce02af9264bca96e3863be071f19236ca8eae0a77
font_02_sfnt_off000137e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1