Malicious PDF — malware analysis report

Static analysis result for SHA-256 3739b09c10b666d1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 03:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f82908129b8d09f617780b1940d6b5e SHA-1: bb37fca2d77168e55ecb877a7e3871dbcccd204f SHA-256: 3739b09c10b666d14c9e0c858e169553bca06e80a1f475a2d1c69c212fef138b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The presence of these links and the overall structure point towards an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=how+to+transfer+all+my+data+to+new+phone PDF link annotation
    • http://sz-nuoyi.com/Upload/file/2021091605030898879.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/zojuwevujagagekud.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oshu1h6gtae9sutk1id2pggjf5/vozamumov.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/zuxugop.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613258bf4a1d1---34919732411.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/90831048681.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/resotipivalumotigewufido.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/2273676045.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xavonokejoluzolafonobepuw.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425ca920885---kenotudos.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/59941570412.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/vogejunom.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kidizi.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4e5eda1408ebb6fc9bd7e19c35d549c2/28745221479.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/noxujefuzukason.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/a0r16vdsr0jbdbppnbn716ve21/sasubopikukajolevogobosat.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/dobogupevik.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/23341690920.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/dulasuxenigozo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/u0nuccqc42ahcg5l7snm67qc5p/parilizikani.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/33266397905.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/40769123289.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/fefosefutajolivugipejuwoj.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_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 10864 bytes
SHA-256: ebb763634eecbbc3de7b765ad60d41aa0af5011b08f2e3c15e88c3cf7986bcb1
font_01_sfnt_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 17628 bytes
SHA-256: fa2dea2136d00d98f48274441c50a58ced3a30ac206744b8a68fd76e9059fb06
font_02_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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