Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbf823bbf6edadc…

MALICIOUS

PDF

77.0 KB Created: 2021-06-26 08:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 665d886f5cd4d2e628b368a07d8a2250 SHA-1: 05770a33e69c6dedd24cb5b1e76d3c0039b03e03 SHA-256: 4fbf823bbf6edadc9aed3f10eb79533e7d5842a090b47a0204e3e47c11e65547
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or social engineering attack, specifically a remote-support tool lure. The document's content, though heavily obfuscated in the provided excerpt, likely directs the user to download or interact with a remote support application. The presence of numerous external URLs, many pointing to compromised WordPress sites and disposable hosting, suggests an attempt to redirect the user to malicious payloads or phishing pages. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://philabc.ru/uplcv?utm_term=5kg+hake+for+sale
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e849f642e2---57706505974.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16089796ddb516---50478239754.pdf
    • http://studiotecnicodavico.eu/userfiles/files/71353545275.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/7aaa0128d78ac90f3c5ace537597f814/likafawefesekunari.pdf
    • http://cafegreenwichvillage.com/uploads/files/zuzojam.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e231d0452---widuv.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160900d61d842f---98722104766.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210603_045722.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/pa1lff405lp52tbq8n9498gocn/dejat.pdf
    • https://0900107678.com/upload/file/73571381451.pdf
    • http://asesorgubernamental.com/images/file/penadibu.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2rarb37vfspd0ufkieqmgumh1n/zevuk.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d95418dc11c00d841db73ec20b6cf9b3/linubawiribes.pdf
    • http://mid-europe-ex.com/images/blog//file/ledopigagivusotaja.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43cc9fe0ca594ca1a9eccacbdc410a6c/99992464795.pdf
    • http://amandamaitland.com/images/file/24029050960.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcd88d0e4---46394371387.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2de359ce54f23f4e99090e83ab2cdfd6/boketiwile.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cada82120232457574a88197b7dcfd3b/vadawapa.pdf
    • https://xosobacninh.vn/webroot/img/files/66711878216.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/zutovagi.pdf
    • http://e-hematologica.com/users//file/nufifasivok.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/1qauskic9q1ndarokongvp2q9c/gasinixawadixomo.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105080122533946.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rebqfr624kfrh8962nvg8h7fcq/netinaxuxikokiretekanulol.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_off0000ca85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 16792 bytes
font_01_sfnt_off0000e297.bin
5d3e418f0be76920738301c090dd6220e4567e0fac93ea67f100b5fb8b7fdea1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 17024 bytes
font_02_sfnt_off00010f62.bin
fa87cda05785e7328446829253422d8547f88314395de0dc0d55375e1dbc88c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 10328 bytes