Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3bed61ec3b20e2…

MALICIOUS

PDF

85.0 KB Created: 2021-07-04 21:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 78b32093a68a4e8e6f546cb4d256b109 SHA-1: 1f234efb0d68ddd456490ffa8c88d6ba922e743c SHA-256: 9e3bed61ec3b20e275bc913d2222d4fd16da70e81e4b1bcd0493a6e292d28cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://clumba-indoor.ru/files/files/lazabub.pdf In PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/bonegudiwukenox.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/78984608947.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607187578b9a6---torodenukulotafumetireri.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/16245687902.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7acaa2c2---97090596788.pdfIn PDF document text
    • http://abc-tel.ru/data/File/zokiwo.pdfIn PDF document text
    • https://kristinanamaste.eu/files/potidetogotigesukezema.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/92760020338.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/fbd1a9678be3de642e0a2e8f5cac9750/tolamewabanosus.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/70e41dc4eeb35706e4030004776d7078/rimelujogezeleluj.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a1b0f0e7c2rqn8gttltk3nip72/86903815314.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210630033858.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092956af3240---85830622644.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/96324415995.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec3a868b7---vikifozisuvubipu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754a1814558---bodizenuxikimanevabafa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d126e18e19---14862945157.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f083a7beed---vumelegulatom.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/95995886859.pdfIn PDF document text
    • http://haphadoor.com/upload/files/rozomazarovarezevedojof.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/19838384848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=right+hand+drive+gear+patternPDF link annotation
    • 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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 16596 bytes
SHA-256: 65d627c05c7edad05817b5657f817c0cf7ba768edcf4a27b4e425d2b0943ba1f
font_01_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F84 10448 bytes
SHA-256: eaaa0e051357a8948ef478f0821b00cdfb02f56b25ceac4bef7f2267fcd412b1

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