Malicious PDF — malware analysis report

Static analysis result for SHA-256 579e87eea4f9458d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 05:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cbaf9ba6d152006bc0f5b2b28435dd2 SHA-1: 6b9b620974ed0734d93ad033044f2d3b9418a0db SHA-256: 579e87eea4f9458dd8f058bfe21f9185e1e6dde8ab21f80682e591d558e4ecde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a secondary payload from one of the provided URLs, which are presented as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4579ef55---gijigo.pdf In PDF document text
    • https://baobiachau.com/luutru/files/zudowavoxutozisajer.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/kelisedowatatilazodubof.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/10363683655.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/53223419081.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/nunokiwiwusunixewofabibe.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/vudafavavula.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/sojitotexodizeriboja.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/21638117549.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gd6ihdr37ebec46jtenvr9bg9m/kewamudaniranezewog.pdfIn PDF document text
    • http://bamor.org/userfiles/file/40434977298.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/xobutokifunalekoj.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/87576963319.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d25883698a5db5e96043798f9e5481cd/lixipo.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/jafedajali.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/wepenalowa.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/76623328814.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/26269731129.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/xemite.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/79483242903.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xexiroxowe.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/5010539830.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/84638985388.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/31592674875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=funtouch+os+3PDF 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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 10044 bytes
SHA-256: 35c252c0bf8e8c7c7ec213bdaebc5cbeb5f682563905d4580d49963162f2e381
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 19860 bytes
SHA-256: 7aff0f531d92185f36a75fbc239805141f7b449ac0ec5d6633ff23edc05e4a99
font_02_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.