Malicious PDF — malware analysis report

Static analysis result for SHA-256 b186279518c2c9b9…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 12:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ff1e5d83ff08c43aaa08043308ebc319 SHA-1: d5dd2af45a2e12e456a08aaf86b08b0a3be72c90 SHA-256: b186279518c2c9b9fbd109d66d0f467fb50e26eda1b9cd36454b3b6ba451cf93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that function as a link farm, directing users to various external sites. Several of these URLs point to compromised CMS uploads, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=webm+player+android PDF link annotation
    • http://ccadl.com/files/20210903165413.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc52a03b1---wevenijipidevovojopisibe.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/7294893589.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/jolejejulijo.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/burugutetel.pdfIn PDF document text
    • http://njxinbell.com/upload/files/8491793269.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/rejowunil.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/zudeva.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fefowenepupedon.pdfIn PDF document text
    • http://irollee.com/userfiles/file/mixijizegafogudifidowaman.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e6aae499b2435bdf75bcb6722e3774db/75028857842.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/47306722932.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/56405197907.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/vedebakipomuxorov.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7eabb41b---21907045629.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/gutug.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/xorewaxaxevavedi.pdfIn PDF document text
    • https://airxps.com/userfiles/files/babikezaxezoz.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614d43db1ea5b---69275439667.pdfIn PDF document text
    • https://highrise.pl/file/40959145582.pdfIn PDF document text
    • http://retailcop.ca/files/bopabof.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/75454407627.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161450c2e4c80a---bogonoxutej.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_off0000ae62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE62 16292 bytes
SHA-256: 164f213f6be446848970b7300908dafd9ee4d6bb700e87d77b0d79fbac64ccb1
font_01_sfnt_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 10532 bytes
SHA-256: 98fbf91df459473bdab72677123e30934344a9f45ff58e61f855640b41525f7e