Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b33c512780d83c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-14 18:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca47936523eecb44ff7dc31ad88dfaf9 SHA-1: 02be0e875a8446899a6080670bba377f8f7bce64 SHA-256: 06b33c512780d83c59a1adccc30b3976d76343e8567f936fdd679e286b9f7103
156 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the finding that the document's primary purpose is to host and distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bravo-hk.com/userfiles/file/49741159672.pdf In PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/patukebazuwedilepamafura.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/66744026833.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mojiwapamupevufakakuloxep.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/sabur.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/88043048160.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/pareburuzuwida.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47cfa9fb2---32587071489.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/kamebibewirotuvasibi.pdfIn PDF document text
    • http://zatacorp.com/upload/files/30867644735.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gufarapeborerumasik.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210903_2D72A50D11C668D2.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/ruwedegi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/af3069691c2d9c33ceda248c212ef424/tabarofisudolofakeraxasev.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/64586360223.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/nuvodowemeximubuxefe.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/8614571290.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0e0ee4ce9bdad4471fd135bd5c746c70/wogetudixinaxezagewimi.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/venuvud.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/jubirut.pdfIn PDF document text
    • https://bselink.com/userfiles/file/61023223832.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/fuzajufuv.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/munogarul.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/soweganiremenoxasakawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dolphin+emulator+32+bit+androidPDF 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_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 11020 bytes
SHA-256: 09225373cbb884adb54c836f2d67391c6596de381a83ea28ac545cb6d779701a
font_01_sfnt_off0000c976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC976 15512 bytes
SHA-256: 51650d0d18f9c76dc95f6ffb7438795bd201f8a9e72f2d4a984ff88734a1b185
font_02_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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