Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8f52602ebd54f9…

MALICIOUS

PDF

90.6 KB Created: 2021-09-04 22:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39d454f8aef2e10b2e8961d8c53641c1 SHA-1: d0ae5c0cb19f9a448428510dd2b547003becaf90 SHA-256: ae8f52602ebd54f9acbb3833d7b062dd7286fecb08be5db34803a285be96f32d
164 Risk Score

Malware Insights

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

This PDF sample contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://douzonebnf.com/upload/file///musixupemegoxonom.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h0is29ma07n66fo6cbo3viptr5/93245966826.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xalebowezilozu.pdfIn PDF document text
    • http://idroter.org/userfiles/files/40002561270.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ef1ab1ef73edf29f390a767309f7dfa8/kumevafutedokomejiworib.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/60057265331.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/325d8ad303a0d394c7bac0c942632cfa/3445776248.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1628195787979437223.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4548b41522---90344280185.pdfIn PDF document text
    • http://caramelitos.sk/files/71755305859.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/30496868500.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kla19fkikbg09ua3im6b3c62o1/satoliwuwikone.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/todun.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/xifixatuboxej.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/53219633761.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e54a48039e5c6dc232fb026a48b88573/7623350439.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/27639549066.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e1ea2f0096233db84e901a3d2a352757/82818761167.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/ropufasusanijaxiwibutipug.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4d9ee28166e512bc1ece46aa52693f13/59686220917.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098653bc4780---wowar.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3e9f133a5fda6ec68eb609820a2b2c10/77616680475.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820d3e11df2---tewesuj.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7qd35djdpeteqm89eb4g4jda70/96436091782.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/pibivutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=handbook+of+digital+signal+processing+engineering+applications+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_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 18376 bytes
SHA-256: 421c72c1e45880a030729ce0ae79e36b4a0e77e7f8e8e2ca0e3b97de4540c4e4
font_02_sfnt_off00014296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14296 11016 bytes
SHA-256: 8a89eab0a0d780b23bb741afe9bb77659ba0faee7523ab088854328a5c26957d

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