Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09335b2d3a57277…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 00:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9da075e45e8766523724300ced63d299 SHA-1: 7026c0adf10d73e5ead5b8bb521d5e1fdd207d2d SHA-256: f09335b2d3a57277f5d7a0630be35c6efcedea6ec6ce60eb9135ba8feb2194d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://nomylo.ru/uplcv?utm_term=tenet+free+online+watch PDF link annotation
    • http://erimti.com/userfiles/file/kawizegejireguronumeju.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/31207817751.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/17413645010.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f02bc2b76---51849372233.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210907_061152_6286.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/57261261983.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lcgkln8hteo76qvsh7h0gdrgrp/wukozowogabopikimufudaxap.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/38450897940.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pukizatuve.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/09d9e11ecc4111d993e55c166b12620a/47615204527.pdfIn PDF document text
    • http://methese.com/upload/files/setivotofaraloxupenuxuz.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/duzidabavutalowataberuges.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/genemiwutofevinopux.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/gogilituwigedem.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/pawepuniza.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e2c73220---23978532710.pdfIn PDF document text
    • http://travellerisland.com/files/53532676061.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a474ae7b8---ziviwanegimori.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/28046698432.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/zaxuvajimif.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/ludevutoduvudepitibudif.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/12b09c552c1f423e665b5d9d691b627d/pukedizebupuruju.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/11085119115.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/gulorinuradatagerefezaz.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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 18912 bytes
SHA-256: d8435702e5d1a35868ec8f6f2a88341902810089ddc7455778298ac42f2cc73b
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 10312 bytes
SHA-256: 543f5114c9a775991f05ff6243f1396363f32f371672e5e71de1fa599bb6be8f