Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f485ab7157dee88…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 17:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b4ad8b9d2e1029b385f7b65ac5ff0848 SHA-1: 3c29af2a7949c58265cd37e3802ad61a573d6bf1 SHA-256: 0f485ab7157dee8897d3da666fdbfd1986ae485b66fd055892abfd0dc452927d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://medvor.ru/uplcv?utm_term=free+v+bucks+generator+hack PDF link annotation
    • http://rjbmachinery.com/d/files/46898870066.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/xikopaxumo.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/54892784279.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161402a89c6806---sowusutoma.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/losam.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/71689402001.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/raxuvo.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/lagabaxeronukususogavifat.pdfIn PDF document text
    • https://foulardfotografando.it/file/8626603576.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/80696184083.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396aaba6433---16914807943.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/58404508259.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/56330589799.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/denoxok.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161404af3ee6d7---bidejifejorerunoguxulud.pdfIn PDF document text
    • http://bdsductri.com/upload/files/kajibakunawajozetid.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/tusuxonapizabodazedi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144773693142---zelukakuzeroxejitali.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/lovufavakabefag.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d74d7b1bef80bbb05ff9627453c4c7dd/kevumezu.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109012153392099.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/41938844847.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/xijanevojevawavebime.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_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 10744 bytes
SHA-256: f07de60f2a889b980528e9198123509b158b984f79a3bf16567baa8585e39b7e
font_01_sfnt_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 17604 bytes
SHA-256: 82202797835b09ae149e3b8313523fedc515857ad77297a553504292ea872119
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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