Malicious PDF — malware analysis report

Static analysis result for SHA-256 59608b0faa652673…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 15:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d06f0eae11abf0a834d46b2522d2aef SHA-1: d435d7c01fdeae6cc7af2fac21c96075be7f0e8e SHA-256: 59608b0faa6526732acf5914fc67c197ac15c1d226493c87cfc4852b7c490356
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=eskom+load+shedding+schedule+2019+pdf PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136386a76e9a---81303537224.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/lakojexazilurij.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/nunazorelubaboki.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb71b11f5a---mekiritipoj.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/cd0208d56b3efadf51fd3b15b5e40073/dikilopowarufuno.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vagipotimepurofadunima.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/bivujupazukifugux.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630705502.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5638qiogp5v7l26pgv7hr30p61/nusisokalovobaxovupaz.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/ketufuwovafiwige.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/12269406501.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/zewedinopunoli.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/66933286307.pdfIn PDF document text
    • http://parilka.by/var/upload/file/josakanogodaxonatudafaj.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210902_950BA765EF78F67A.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/67943609719.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/95708613590.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb650c48d---gezobegonokubavalal.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/11649422056.pdfIn PDF document text
    • https://mauspro.net/upload/files/wudujurexir.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/89992498234.pdfIn PDF document text
    • http://hidropro.hu/upload/96408642918.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/84349996878.pdfIn PDF document text
    • http://orem.mn/uploads/files/4818238627.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/pikidenene.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/26067074895.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_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 11504 bytes
SHA-256: 4b1ebbc9acfd6027b77f6836b257cd9a1dcbc735c87d1616457e75ba5b6dcf25
font_01_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 17272 bytes
SHA-256: 4b210b7873dde65ad871e4a47d8c905cab9fbd1facfb17eb15daa33cc50d571f
font_02_sfnt_off000123de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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