Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefcde80026a5414…

MALICIOUS

PDF

95.6 KB Created: 2021-10-07 15:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ac3af9d6f40c607c368c07d3b83e1652 SHA-1: 6e2f11125f98000bb9174070522244cedfab937f SHA-256: aefcde80026a5414506279753826c17ce2ff170160615e40b7ad4e21d403102f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware delivery. The embedded JavaScript likely facilitates the redirection to malicious URLs, such as the one found pointing to 'ketchas.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://ketchas.ru/uplcv?utm_term=the+fear+of+being+watched PDF link annotation
    • http://ocean-ex.com/images/blog/file/pozovixo.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/kenij.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/vomidexinusisoz.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/1616960387.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d239a537c6b70c600526a19c7c04dfb2/wotusazixokedadafitopoz.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109201902029345.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/fojatorarino.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/8267714922.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/19008556596.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bf076da2---46274293502.pdfIn PDF document text
    • https://arerp.kr/data/file///sutaladusugosizunopisituj.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/69104759024.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vetigasagisogegozijajemob.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/kojenibikaxutujosavabaxer.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/72167130368.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/logatapurogavujip.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/83363596746.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/munakuwunotebej.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/jasidedilatidilolapurage.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/45630764416.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615b9247da69c---zizebawodipebuke.pdfIn PDF document text
    • http://merwepizza.com/upload/file/dipipogotunifa.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/nadelazozamabopesuv.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4vmldj0ope3r13epgkl7o91sli/bufutenetawalis.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/wovawawe.pdfIn PDF document text
    • 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_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 10728 bytes
SHA-256: 03f7d07d11f8ac704bff7119f8cfd0e77225ce53f9085c52378b4c00bd158801
font_01_sfnt_off00012275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12275 20732 bytes
SHA-256: 0ea5c8f67a42b5633ca815d2c33aec3f23501178010e90d2c08b38ef6a721f68
font_02_sfnt_off00015895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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