Malicious PDF — malware analysis report

Static analysis result for SHA-256 024cbc4d1bc7d6e8…

MALICIOUS

PDF

90.5 KB Created: 2021-08-21 12:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bfffca90d7ed74ac2a845f3d61114a7 SHA-1: d0b9dcd8f1df3caa75657ffda4537222a526a753 SHA-256: 024cbc4d1bc7d6e8b615d99a4c7e2d1ab8c32256b8169ee02cf66da4d7b1d844
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://myapartment.de/web/editor/files/22477262249.pdf
    • http://cityfate.com/files/files/10673687748.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/688193c8a14f2f534b5d2935a82d36cf/savefadevesofavebevika.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d581ed301---bibejubesinafojaxosumibim.pdf
    • https://airshow-bg.com/file/paxatibowebakuwad.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bb49272db89---xisubupe.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b651f773bc1---weputegegibepijakenineko.pdf
    • https://hgb.se/filer/file/61145944902.pdf
    • https://dbjadow.pl/attachments/file/nurevelegexawowumotajut.pdf
    • http://varadimasszazs.hu/uploads/files/rosulotarogodow.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/2374926179.pdf
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/figukesigumogagixoza.pdf
    • http://www.urbanwaterways.info/files/83131114288.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a697db95e21---16124043791.pdf
    • http://tochuchoinghi.org/files/84171080898.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mk36jjvi9itbq3v10e2lr16vmm/482563777.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4aab9bab4---36733528786.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d6983ffb---rikesonunateg.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ecb24a5a---6120300212.pdf
    • http://locthanhwindow.com/img_duhoc/files/bedaxe.pdf
    • http://tks-forever.com/upload/2021/08/09/file/somufifo.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/5152687532.pdf
    • http://vilocom.net/webroot/img/files/22257606584.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/43599104408.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609210b9c0e37---kidatawusipodejojuxeset.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9a8b55b4d---77083910944.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+level+3+microsoft+rewards
    • 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_off0000fcd7.bin
2128602eb835e57b54f4da41d3f61cb3960079199c3e06ad7b6bd8d465e081a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 11028 bytes
font_01_sfnt_off00011668.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 16792 bytes
font_02_sfnt_off00012e7a.bin
4d96f0c0c06095c11d0609a985d257a4a9919e9b99b9db137505773a5c9db6db
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 17104 bytes