Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fe12dbb7cb8eca…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 20:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44bd61aee507b3a3da594802b7af87bc SHA-1: bca2b577900b8917b46b99f0217d4113886be32c SHA-256: a0fe12dbb7cb8eca7f0cb0e3a2687d9cfa1e815bc540d5ecee3e13c895793475
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is a common technique for executing malicious actions within documents. The heuristics indicate this JavaScript is used to create a link farm pointing to compromised WordPress upload storage and other disposable domains, likely to host phishing pages or malware. The ClamAV detection and ML classifier strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://longarmquiltingacadamy.com/fckeditor/userfiles/file/20399553397.pdf In PDF document text
    • http://cleaner.pl/userfiles/file/53660929853.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43289446636.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kemejesibimasizimojazo.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/bikubexapizibavoj.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/69021589070.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/450328804.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/galixebidamivudegedenoj.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/wojuroradesovedonufov.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/78049709516.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/wisudedelekozabuzemi.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/65629703312.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/072f2c61a5f50c5a9a195cfeca9fe734/pagelorebigimapijulilo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161335d41d20c7---dufidefoputewafemu.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/82321834758.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea1607bf72---menopesopulozobofi.pdfIn PDF document text
    • http://katela.net/userData/board/file/65111448083.pdfIn PDF document text
    • https://hojoairport.com/images/file/tujaluzerizezitirelaro.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/lubuxukubozafegose.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/sodubeda.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/bijudupese.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0772ebd6---6782620952.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/23554060745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=finite+arithmetic+series+calculatorPDF 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_off0000d685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD685 10572 bytes
SHA-256: 83bb737f36b9817ce229c3ba110762e28142d9b27d92e07014671d72fcb55679
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 18232 bytes
SHA-256: 04840067ebc152ea73675462de5cc2bd60fb15ee941a2774c2a3caac26943756
font_02_sfnt_off00011ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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