Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea8175ca9b52eeb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 12:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6badd799d892f054857f153ee735c87 SHA-1: 8ff880dc212c90c6d53d6a3fc7f0c802099abc59 SHA-256: 9ea8175ca9b52eebba9cbb511f136673884d6396c7e93b395f2691a6720f6e66
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=finnpipette+f1+cliptip+manual PDF link annotation
    • https://an-professional.ru/img/files/file/34750350177.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/41055805817.pdfIn PDF document text
    • http://888chji.com/userfiles/files/69673372735.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17dfa6e50---bitekuloro.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0asg0qe59bc8baktc5u3nqj39f/81773043302.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ba96f57d---39962489916.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/25448477116.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/33f4d4ae931cd028bc5b2abbebcbd898/90973139938.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/33148953728.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/27984016361.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4581f1a0e4---tiluwapozazarigekubov.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/60416020562.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/68705179600.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d21a0f1a4---mapojux.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/kebuvuroval.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d50524e846104a2927a7cd6bc9c7eb9e/zafozujo.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kokikukituro.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/goketunufuvopi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6d36c0a7---tesiw.pdfIn PDF document text
    • https://proxus.nl/file/waxapijidofuwolub.pdfIn PDF document text
    • http://cga82.com/admin/File/37496823376.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/53467031378.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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 18748 bytes
SHA-256: 9b12b3bfbe99a862582d03b33059d1ebf524cc405096ebf34122e914f9f46c91
font_01_sfnt_off00010d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D72 10380 bytes
SHA-256: 6923a6e614b61a25960edc278d6f0953c0628244002754692a6b07270b9feeed
font_02_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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