Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bf0dbfbc9697ec…

MALICIOUS

PDF

94.2 KB Created: 2021-09-27 08:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1bdc6fdc80e3597e83c654f8b45a9b92 SHA-1: f1a3728ff309e5ca70b619b616abf357569967ec SHA-256: f4bf0dbfbc9697ec5978148230e4c14e573b26a189f816b07bf9e4ae8e07fb14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://roarmysecurity.ro/mm/file/jaxekarakufejulofumabiga.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabd1dee2c---xaragigajadog.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/46880902952.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/64295494189.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109112017379492.pdfIn PDF document text
    • https://webmanagement.jbclub.ro/images/file/81046871019.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/noduzafezob.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614884719f2ea---resagosumavekedatajituw.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/37725861795.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/g74a5np964q3ba6vg8335rdk94/91668921526.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/45806919911.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/24621225847.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/tupapejalivotafudo.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/78744746459.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jurotanorazazutu.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/46597233497.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614780fc695b6---61988783692.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/52482391261.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/gemepugaguwojanobukuweget.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/285006062.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/13485892739.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/pevilijefiva.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/tiwusonafubozejisuf.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/84535044770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=poker+online+uang+asli+di+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 2120 bytes
SHA-256: 7ed3b9ae03246875c1a6410da8089704547f62b001536b5ac74436123f748c1e
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_03_sfnt_off000115d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D9 28836 bytes
SHA-256: 70c8218deb0879d82450674c8645e490542cf5875ad7b9b85687f9b0d34b1357
font_04_sfnt_off000150cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CC 10516 bytes
SHA-256: 0b2a497f12b15a374442c37e334c510e6d509d70a82e002d9a249db56508953c

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