Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b650ba53ed8d9b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 733ce8ec483b598b25e6cf8e9a3f00f8 SHA-1: cb453be19d6e8f306ee10f903701f5f11bd6d088 SHA-256: f0b650ba53ed8d9bc9602e4ca14d9b6111b962bf92e2b038b176ea3f03aaacda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code, potentially to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466102ebacc---bifagusifazedufeg.pdf In PDF document text
    • http://reliancefla.com/admin/images/file/vuvuxi.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pejebam.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/bolofifotuwogoz.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/73687444946.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/11969808630.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/lodedolapelibepisukerosaz.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/savajobojemat.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/11332198720.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ravipepumug.pdfIn PDF document text
    • https://solturism.ro/images/file/86888446290.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/43863531708.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/gilakonajitowam.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/guranirabemeravode.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/loroxa.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/revubitelaregenoseponukev.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/59835685576.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/65226367916.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/76247450351.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/93588019658.pdfIn PDF document text
    • https://basisangka.com/contents/files/41641340901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+free+gems+and+passes+on+episodePDF 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_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 10872 bytes
SHA-256: 154afe4d5a9392754fb904aa2815e908c38f429b17a83af1964b841ba90ef27b
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 18564 bytes
SHA-256: 69608bb76ecb608df5160feadd5a3ae709f847d80b622dcb65320d3eddd5f69d
font_02_sfnt_off00011f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1