Malicious PDF — malware analysis report

Static analysis result for SHA-256 f984b7d9dfd6e296…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 13:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f75ab015be7f652f308bcc8e4cd5fc5 SHA-1: 5f69a9514448d8ccb9379c69d673482e7b78ae11 SHA-256: f984b7d9dfd6e296d05e08da8c88ed3c02a5edd013a7156c911d150dcb99e7bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript (T1059.007) indicates a potential for malicious code execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://bestapp4u.com/admin/uploadedfiles/file/31401667411.pdf In PDF document text
    • http://opusbiz.kr/data/editor/file/13725653206140413f1a4e5.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/72907761004.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/78290428546.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/duvemonekewik.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7eabc2e12cff2f6fdb3c6b3d805ed964/wuxisudafuwivupoju.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/kodoko.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6114227c---89406889042.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/81661374713.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/femafepexituwuvepopomunel.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/xasudorulopewipumisibiwu.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/jaxipofuwixawukixiwut.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/7528084041.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/bafiwo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/tuwofujofodomud.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/69100250837.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/12249107344.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/beguvilipam.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef6f33b45---98649331608.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613978eeb8668---kebijatotuwejotemed.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/93518509749.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613165720411c---raxasesivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=merubah+pdf+menjadi+ppt+onlinePDF 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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 21072 bytes
SHA-256: d7993f86d5b1b5afe589604fcbe754e37bc6e047d2fded87cb8198aa25551121
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 10956 bytes
SHA-256: 33af43f7592d53aaaeb653f501dc66698278e4a837b33618fa2fac0b045376c9

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