Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b1d83c2261fa62…

MALICIOUS

PDF

101.2 KB Created: 2021-09-06 03:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc43e4828f0ee2e68fb1261104da6978 SHA-1: 229d1e8f3c7d94f4e0a7a981c142ac9016748dd4 SHA-256: 08b1d83c2261fa62cc9f2909d02c1e023dd8e0dbc58982bcd48a3e91782b0e11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress sites and other domains exhibiting characteristics of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://viprealestatebrokers.com/userfiles/files/98606308562.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/98118295723.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642c5878de---kimusezigipapolu.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/87610660897.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/wotutewi.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/1uds8ci0vmv579emuf60933b3t/xuzigegevesubolog.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/52v7bpfpvsed1a2982uf0de1m5/famul.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/botovu.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/25529928373.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c209c76f65860c7ba86a6e1d93330534/1535272529.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0418d8192---16109016997.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161238f8944a8f---15090726011.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/84893912523.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xebinotamaj.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/96680202101.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/tuwanusalolusuxasox.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608240785d5c3---95943094542.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/78218758718.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/fusavivumarir.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/monoxupototovesosorir.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b773b22931f---26692027757.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/l48o7kn132kakog3vb49kb6mj6/90133751437.pdfIn PDF document text
    • http://quinta.cl/upload/files/tiwuvoxamedijasenudenime.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fe1d83c3c0a65b055ec2d50f9ec47462/simaraxol.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/likurewoxokuwiribibugopap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=que+es+presion+en+termodinamica+pdfPDF 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_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 21644 bytes
SHA-256: eaa9b6b0e44e8af90d9fd3882d6a49a0a3c79dcc20f76ad97ad2253d66c313a4
font_01_sfnt_off000154f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F7 10892 bytes
SHA-256: 40199f6689b8dc45e8a4d917e30dbc27e22fcfc53b48af51b2b68e1c8ba3b433
font_02_sfnt_off00016e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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