Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c65503cd04bfef5…

MALICIOUS

PDF

130.8 KB Created: 2021-09-04 13:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdae6229ec9264f5689f44cdb7eaecfb SHA-1: 619bff6996025c5906c74d1b562095b8b50f8613 SHA-256: 7c65503cd04bfef5404f39cafd8209fa3be582952d4ff0a75dce203f5c4218b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf720c2bc---84933465915.pdf In PDF document text
    • http://sgd42.ru/userfiles/file/degiwotu.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/29292378864.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/tituji.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ap565sga88ueavj4vl0630t9b/fobusaxeba.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c187e7b29b6---21097739894.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/vedipip.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210621111434.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b093b3194741b14ac992d6b3b9bfc686/15342738465.pdfIn PDF document text
    • http://carszana.com/image/upload/File/35034676056.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1e5dcc7d---14656690117.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a14419a21---waxedesujosot.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3s22re908uipdkqseap0r403ht/68933858334.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/41484726313.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cefcea99eb.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/91420990476.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zajulinukijodonomiripefax.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/950a43b78c718dff15e028a842fc27c0/98111093004.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/13a9b55977b196f17aafd4314239a9ec/2400427818.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/ziwewafutudiwikekorid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=army+detainee+operations+manualPDF 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_off000198b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0C4 19552 bytes
SHA-256: 566e1a017ab2ea0d9e4e5333a34fd30e0f8614b76114f7ae601a058e4e0c9791
font_02_sfnt_off0001e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E47F 10748 bytes
SHA-256: c69fccecfb2d2f4f19780fa90d5966ea4bbe12c7db33f9b2f05ca1133cf786c0

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