Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f916708e5865f0a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 06:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b870784fd527a70ef583d9cc9e0813d8 SHA-1: 8b8fdd27b8961d3e3940d883073dbcad5270d60b SHA-256: 3f916708e5865f0a08d42944290258be2d10da84c8588cf244fb33a6d9ddc58d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

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://bptramptour.pl/files/file/metazijutiwokexasij.pdf In PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/83031661590.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/mivisoxava.pdfIn PDF document text
    • https://ikansambel.com/contents/files/26182644005.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b68309fb19cf938bd20d0b03e703146d/11153810777.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138365d746bb---91614921794.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/vatenefu.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210916234245.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/xudexotisifed.pdfIn PDF document text
    • http://metabolit.ru/files/file/pimik.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/tkugc4694spg1eq7ho2g805fe6/jolusowororujinap.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/bodavevewur.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/vudoseketujox.pdfIn PDF document text
    • https://designclarf.it/file/74680840095.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/vomuga.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bepozeviwev.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/wowuke.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/disevamuxidevebolurap.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/56301891520.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///91763025526.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/wekeveberujide.pdfIn PDF document text
    • http://adveotec.com/img/file/tupisofutam.pdfIn PDF document text
    • http://savemaxint.com/files/file/figuvedizawadexowedafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=photo+editor+for+windows+8.1PDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/wadep.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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 17712 bytes
SHA-256: d0b62632bf1cff273a8e7e972f745e19663d49780c20386a93cb00fcaf28b1e8
font_01_sfnt_off00010ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD9 10656 bytes
SHA-256: dc2d4914fe42949d3f72d14865f759e0d703d03050e757af1ce38f7cec4d4594
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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