Malicious PDF — malware analysis report

Static analysis result for SHA-256 30860eea664fd854…

MALICIOUS

PDF

70.5 KB Created: 2021-09-02 22:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 28e6e6745bc264b7a6fcb7a5510e1509 SHA-1: 3cc5ca566c631acf7ee3708aac883289d907669f SHA-256: 30860eea664fd854137048206cf096c4f98f74ac280d4d2ef410b9ea3545a165
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting a phishing or credential harvesting attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The embedded JavaScript likely serves to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://yangpupark.com/uploadfile/files/32729140897.pdf In PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8387b9030---fikulebajuzo.pdfIn PDF document text
    • http://letdentalab.com/img/files/modoniveni.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/forumajadotu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d6e1705b---sudonuledumu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fba00e73d---vivuvikawazukusu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa9716050---vegekotimoxoveguwev.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/62575122888.pdfIn PDF document text
    • https://parfumzone.ro/files/file/nomegimixu.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kobazujigilofebodine.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/gokinomexigosidobemuro.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/74491422564.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102995a454f9---27787913486.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/fawobobozoje.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/tisij.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/18939437248.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-21/20210721045213980186.pdfIn PDF document text
    • http://congluc.com/upload/files/figotujuvanipa.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/26745720359.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/94717083741.pdfIn PDF document text
    • http://orem.mn/uploads/files/83228752266.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/19955752005.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/86011584798.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210526184607.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/puwiruvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=conduct+disorder+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_off0000b6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F6 10536 bytes
SHA-256: 9edc0e0c8718f2d428d23bf38c72d8b472b4f48927f0e3a69e708b5f0a02598e
font_01_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 14972 bytes
SHA-256: 47f92c58fed1ad57a681f6ae454534ee5a8a8708c5c905b591087e3ee56cbd8f

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