Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2fc363f8e41948…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 16:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 341510793c080be416e4946466fe0bf6 SHA-1: 20182991c212ff845a4d5bb6138123dd97f3ef48 SHA-256: ca2fc363f8e419487e62b4bc56f3df65d60bfd4e48326ff5358c5e2066b24429
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=windows+7+home+premium+x86
    • https://bnovum.hu/downloads/rokorofejomokizesi.pdf
    • http://all4pets.cz/ckfinder/userfiles/files/molopebir.pdf
    • http://michellenevinracing.com/FCKeditor/file/ziwenejukijineberof.pdf
    • https://tjp2-hotlink-j3t.com/contents/files/78809503722.pdf
    • https://citytrafik.nu/images/file/40822504338.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161396e26beb70---batidakos.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/85417840659.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/numonemagutozaza.pdf
    • http://hani-bee.com/userfiles/files/jeruwufigujanevogelow.pdf
    • https://huaku3c.tw/uploads/files/202109040651551766.pdf
    • http://hytechcommunications.com/userfiles/file/43386570020.pdf
    • http://pxmonastery.org/CKEdit/upload/files/18151645378.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3ed859c5c62bdbcb363d4df9ec7a8e68/21788533966.pdf
    • http://goodlife88.com/uploads/files/dipakebowerodonijojafodiv.pdf
    • http://ahkjt.com/upfile/file/52573012206.pdf
    • http://behtarinekhodetbash.com/files/files/kigujiwutagexesezevarodig.pdf
    • http://snailgame.ru/upload/files/20210907053457.pdf
    • https://ctyhoanongangiang.com/userfiles/file/gepowajo.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/mopipezamibisumetojoni.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e11abc944835b910ed9d72421aef750d/998301325.pdf
    • https://booburger.myagenda.cz/pictures/editor/files/rofotejitisedumixubataxe.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16147434cb5342---nikeguwifiweza.pdf
    • https://atputasbazes.lv/images/userfiles/files/3626065602.pdf
    • https://dbjadow.pl/attachments/file/nuratewuzunujibaxuv.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_off0000b099.bin
d9258f7fb7b1216df7713e50bfd0b8fd1123dd1045b0218b9af81117a3369998
pdf-font-stream PDF embedded font (sfnt) at offset 0xB099 15072 bytes
font_01_sfnt_off0000d677.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 16792 bytes
font_02_sfnt_off0000ee8e.bin
f624db83411b8a960833a77f505e39b58bb23f5d79349e9a50ed37a3fc3d34cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 11056 bytes