Malicious PDF — malware analysis report

Static analysis result for SHA-256 6349f71e1cc06fca…

MALICIOUS

PDF

67.7 KB Created: 2021-09-20 07:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f70ffd99dd618974fc3b4fcd5d4d6a4f SHA-1: 00708979a95af457fa0b5515c19149f49375d1dc SHA-256: 6349f71e1cc06fca5269d9891b61609087bf20c085a7274dce8426640dab7fcc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. The presence of multiple PDF files hosted on these external sites further supports the attack pattern of distributing malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cructi.ru/uplcv?utm_term=cute+cut+pro+mod PDF link annotation
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kerisofunekamewejewuvobi.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/jirerosoxujilakilototite.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da48a5af8---wazewogexe.pdfIn PDF document text
    • http://vlajamo.cz/images/file/nilumuxujuwaf.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/islpbheu4p8g07igto2v5p7a26/daripes.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/6888465956.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/xixeradonufefizikore.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/83624801672.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/ranupirexiropawilelajepe.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/21594827025.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090417173175.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/96426702451.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/wilozagigibarusi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j2d9nmhae9evqmop15f2kfn135/47164092410.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/gupafodimarurotuzawuno.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/50613957017.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161413f86ab0e4---rogegiximu.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/95541749289.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jutawixuxexametova.pdfIn PDF document text
    • https://nyig.com/files/file/pefenovesusofasinixufaf.pdfIn PDF document text
    • http://24cvety.ru/upload/files/japozotilisaloro.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/83811675735.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db97501865---73951217579.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_off0000af60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC777 10236 bytes
SHA-256: 65cb2d5a2e985fe0734174aac2c9802c94c20b1ea702bbf4718667d4d1b76961
font_02_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 14276 bytes
SHA-256: 682eb5f155456ad53eeb57b2847aab34916620c829e86b9313b2381cacf6dc38

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