Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed7f2b80fe9555a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 01:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45f7f7f31c902557b1d8309c5c2fd0a3 SHA-1: a4499e5181926870a8fee6fa12df19e53e288e83 SHA-256: 4ed7f2b80fe9555a64178db0bc8dd21b98d43c12701fb348879ede805f5a6504
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://medvor.ru/uplcv?utm_term=gauge+theory+of+elementary+particle+physics+pdf PDF link annotation
    • https://satuldelut.ro/ckfinder/userfiles/files/10200015693.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/72323124700.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/mapufilozaxexogataxiwejuv.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/xafumodopoxijoneteletinu.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/vijinabalasujunujowifo.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/38952384340.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/27706452643.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/llb8sr9nhk0odd598q0rq7blqt/22059810828.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/85674883918.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/winuzokivesaf.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/17615376821.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/32506795762.pdfIn PDF document text
    • https://insp.biz/img/file/6683357280.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/loxexetep.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161419bad647fb---sotuxujatexurisulur.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/79877403691.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/ladufojitamowivotugoseje.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/xipaselevetobemofujudepov.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/fizegume.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/kozonikozeb.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/48584946416.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/500a1j7no81uv95qegrnah71m2/50548835782.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_off0000ae1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC633 11320 bytes
SHA-256: e7a3cc083f5feb21b553894d4560374be5d26de2f7caa396a8be8f1c1a6db4db
font_02_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 15212 bytes
SHA-256: 567b97bbce6259e421064e749b4dde74155494bc3dbe66c28abd5460ab95d672

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