Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb3e828822a5bc3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 20:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37cb6d021d89bd7f3c089ddb6f0d4484 SHA-1: 780b960ed9593653b62ced733684c6b5687e5f7e SHA-256: ecb3e828822a5bc3d490e5043cb0143e8f28dccc41b3f14d6ad4cb8c61152fb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://infrive.ru/uplcv?utm_term=ppt+on+computer+hardware PDF link annotation
    • https://xanbiente.de/userfiles/file/60376324912.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/susod.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e293030de---20561059636.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/3371380570.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/3308372814.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/jususanuxofumanaful.pdfIn PDF document text
    • http://huefpdf.org/upload/file/72023752375.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/zunajovigewogatitisidofo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/87871924341.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/81641939826.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/vunonu.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/21a3969efa263849f4d23aeb9fc2d8ff/72601936103.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/nemijetozinuvewosabo.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/nedefikumigazetu.pdfIn PDF document text
    • http://biomisszio.hu/tmp/65419532948.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45919253873.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/jasaguneguxivasatigeluta.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/11625838152.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/61689286856.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/72613271017.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/78050865761.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a075d69be---90026370505.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/hsm34fdvuvtjc58e1ghuo7rhof/vasoseluvakuzezadop.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3900b5568---nisumitugaxagiladukolijub.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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 10660 bytes
SHA-256: 1eb6d7e8e47ca4ac3e8f0fc585fd9e335ed221c3bb6813ceb851f54d84693f04
font_01_sfnt_off0000fa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA05 19056 bytes
SHA-256: 0c14f5400eb69d0d98cae3dfd30144cd06d080a09b6940caf92d9d56e1b71e13
font_02_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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