Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ec99c15febde90…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 11:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c313f24bacbd84891b5cd708ac3a26bb SHA-1: 5548b3e99b9823a1f45e826863778e0822ad1209 SHA-256: f9ec99c15febde902fc7aac526349f6aef29c64cbdaf8f5ee2a843d280d76a2d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm hosted on potentially compromised or disposable domains. The primary function appears to be directing users to external websites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=xiaomi+mi+note+11+pro+antutu PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/94158db9799599ebaadae18f90662eb9/18015221157.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/dotusagelubetitubizofupuz.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/belareki.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/xomovevevomisubinidogemox.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/zumusegatiselafebijoru.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/parutakiwu.pdfIn PDF document text
    • https://polaria.cz/images/file/14527426534.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/32d3780413e2f3af588cea24b42ded65/31400138442.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/bolidojotevibapojumudelo.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/57550321525.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f02f12f0---dajube.pdfIn PDF document text
    • http://dsraxys.com/uploads/8415395723.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/gokotuvejij.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109101533095670.pdfIn PDF document text
    • https://ghnservizi.com/file/mometawa.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/85745985397.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/62ftch52s54svct5qlsfel84jg/76467182748.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/jetupidajesurome.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/xotesu.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/76174478748.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/zatafuwowojen.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/68356857564.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/61516138927.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/32440005042.pdfIn 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://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_off0000b29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29C 10360 bytes
SHA-256: 673178b5676f24eab4ddd98f3fb51ad88b0aff0ed031d026efa406760be62076
font_01_sfnt_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 16120 bytes
SHA-256: ae2e7d08e5f668ca4c6e2a74a9715f22d3bbe4d2f15343ab68d0fa58c841ddc6
font_02_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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