Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4c92b199050993…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 15:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8733eba4ac10be85dcc8198edd1bd8bf SHA-1: 668a0817444e5bf5ffee80076d9d617a6627bb69 SHA-256: dd4c92b199050993e8396ccb070a8def6dc0f1cfcabd28b0f067155c34a21cf2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery via the embedded links and download lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=fnaf+the+twisted+ones+graphic+novel+pdf+download
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161308521864ca---74476991487.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/49f8043b7f1770e502b4078900dd5720/39984691220.pdf
    • http://tikatalog.sk/_files/file/7797413358.pdf
    • http://kingtonkatsu.com/uploads/files/nararamikepakepizatewed.pdf
    • https://krzczonowice.pl/gfx/file/miwitamonor.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/xemapotolipoxuzerorij.pdf
    • http://thewellmanteam.com/userfiles/files/92165517387.pdf
    • http://naturestuff.nl/siteimages/file/kodimojagumaxuforizaguzu.pdf
    • http://tcsm62.org/uploads/news/file/gezuxufepedumep.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/11fa04f7b3abdb515e81adbc26177388/mipululufedunefulidasif.pdf
    • http://jiehuist.com/userfiles/files/zaneru.pdf
    • http://anthonyvienna.com/sites/default/files/file/vurukewamajufuz.pdf
    • http://ressourcengarten.de/azubi/userfiles/files/82189236599.pdf
    • http://clickvay.com/upload/files/jesugawegunalonajukafil.pdf
    • http://nakajima-ya.com/upload/save_image/files/lemaguvekesez.pdf
    • https://atlastoursntravels.com/userfiles/file/vibifozaxegukogulimokeji.pdf
    • https://pharmnet.cz/ckfiles/files/files/76486671729.pdf
    • http://ehomerealestate.org/images/file/2307550552.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/12468139778.pdf
    • https://sonerofset.com/userfiles/file/pojalalopanew.pdf
    • http://colokit.thienlonggroup.com/Images_upload/files/nenidegula.pdf
    • http://shinhwajudan.com/userData/board/file/ripiwoxasawewejiteze.pdf
    • http://nriloan.jctoursandtravels.in/files/burilogubefibibo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 16792 bytes
font_01_sfnt_off0000ebd0.bin
c689399f28603acd40104e15d01786107fffff416ccd009d4cc062d0b39cb48c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD0 11028 bytes
font_02_sfnt_off00010543.bin
6c7bf9a2e839561635d0238bd6edef297d357bec2bf097fa575913126925da46
pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 18424 bytes