Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bf6aeb2ec8ecb5…

MALICIOUS

PDF

91.5 KB Created: 2021-06-28 06:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e78130abdc5a3e1a9b6a1138fd7c855f SHA-1: ea8fa75421ad72086ba477bbead355d8f26123a5 SHA-256: 03bf6aeb2ec8ecb59997177b1f8b20fd1a5ab290a1e4af79fb25573f9a300c2c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on disposable infrastructure or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://feniks9.ru/ckfinder/userfiles/files/vatev.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210607_45A243287E4ED444.pdf
    • http://land89.com/ckupload/files/74836684577.pdf
    • https://nasikampung.info/contents//files/migalijeput.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2b352439---73966036290.pdf
    • https://bdsvieclam.com/upload/files/raxapotet.pdf
    • https://psychologgia.pl/Upload/file/6346698387.pdf
    • http://royalgoodviewresort.com/Uploads/file/7971468596.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c646a00fb---fuvodiwusefelit.pdf
    • http://blessingsngo.in/userfiles/files/xatedovojak.pdf
    • http://md-servicios.com/userfiles/file/90715387724.pdf
    • http://omni-links.com/images/blog//file/kefugomesolasol.pdf
    • https://stiff.pl/ckfinder/userfiles/files/2624143919.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a72130c6---naborix.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f215ab8c67---58760416775.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qlolb47sbhkkl50u5dq83mg2i5/72736833498.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26d214f1c---fotumukulaju.pdf
    • https://fajanav.com/aym_image/files/dotomuvaje.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hlkirg9gq9pol3c3fjh4psfpe0/gogisefufisela.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b78db9ef39ba2d49e84a116f87b9a47c/sukiseguzefuxakin.pdf
    • http://www.thaiboat.net/image/upload/File/napodesugawape.pdf
    • http://www.vikingmaterials.com/img/rijovenuj.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e22734d4db---31040781157.pdf
    • https://alihuata.com/userfiles/file/kiromurerobisogutemaji.pdf
    • https://cowichanseniors.ca/userfiles/file/44872457969.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fear+and+anxiety+care+plan
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001074a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
font_01_sfnt_off00011f5c.bin
1e493d2894d98e4a82921fe0a26876909a547bb2c9b6cc993e3933cebd928496
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 16084 bytes
font_02_sfnt_off000148f0.bin
4407f93b5953e2f6b26bc3be5bd69b38e44ce0d3fab824a0ad2736fd53eed471
pdf-font-stream PDF embedded font (sfnt) at offset 0x148F0 10412 bytes