Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb4ad3ec337265c…

MALICIOUS

PDF

85.7 KB Created: 2021-09-02 17:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0d249209e2578e5ea6bde9b8e53b506 SHA-1: 611554151ced91b8e48b4dbe95af12deffade96c SHA-256: 6fb4ad3ec337265c2d97027e97451c2104dd8c6fada6f28051423dbda04ac287
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute phishing content or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://rubyyadav.com/nbloom/fckuploads/file/84203982762.pdf In PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/zudidelesunuwaxe.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/tododarexone.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781bc352587---turatulilako.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/37207356892.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1bb730261525dcdafaf851ba73a9e705/bunufejarugevetenufu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/najezegujobapefo.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/48847893457.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/zejuje.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210729151255.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/l7o3ekcvv35hlg529v6d7h8h8a/93729760524.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/larolomogezilakedonadepak.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/64398123302.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/winer.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/10908083811.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a58323ee---luvoketakepegitusetibi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ba965edf3b---togajoriwowalew.pdfIn PDF document text
    • http://remobudostol.pl/pliki/luzokokoxukasununom.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d890e622057---rinuxamof.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/df5d8fc2a8dd14f5214b823f95247a77/xusumiwu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/63504655244.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/11675649760.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b767c557fc7---dusememajerevefutesav.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7763628f60e0a8374c24727f11187ce8/49668393841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mieux+parler+anglais+pdfPDF link annotation
    • 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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 10652 bytes
SHA-256: aae458374840a153a3516858f8b586ee769b767ef4857f2227ca6d5179bed469
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 21168 bytes
SHA-256: 9a2ddbea8f1a7b8a5081f43df4872cd22673d972c7e7aa3e2ab2a121bc626634
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.