Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f279a2ba2b4e330…

MALICIOUS

PDF

85.1 KB Created: 2021-10-08 03:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 909e45ed3f085bafc58d58f04a8651bc SHA-1: 7f95466a3dd1755a8b5b969d60e1faff1fa108ca SHA-256: 2f279a2ba2b4e330fc91135abab7db9cf39fbd9c1bdccf6e50213c61707a0a19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs indicate a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support the malicious nature of this file, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://kamnitikamini.si/upload/files/xemomunanufarixi.pdf In PDF document text
    • https://prosaison.fr/userfiles/files/73637081335.pdfIn PDF document text
    • http://immodraft.eu/images/architekten_agentur_images_/file/finasonuvi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wupopakutuje.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615623fe891d7---tazevukutelopa.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/siliwam.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d6733c979---gekevomod.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/xurawomofufisikasalagopu.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/duwisovorifenubur.pdfIn PDF document text
    • http://status.cz/UserFiles/File/78942707408.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/mafiganafobegigeduveboz.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20211006182051.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/namawa.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/65110256432.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/mekumudenegolabup.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/zarugizakomevalana.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e11f8bfad4---64781876979.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/toxax.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/48226604427.pdfIn PDF document text
    • http://bushurov.ru/images/files/burujiwisulufafoxawolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=y+group+air+force+model+paperPDF 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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 18708 bytes
SHA-256: 80c4d85b90fbf112a6f8821a24b618e66acd128b7eb745c8e83f9822be8b7c52
font_02_sfnt_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 10676 bytes
SHA-256: fa67ac132737c619aae51cf108dd5b82dab8e0305963b70d554e2f391eeb6128