Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbda701baa5a840b…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 21:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b55c7652f8b584243ba3a9ebf90db4ca SHA-1: 68969ca07bf68a4b6ddd03db40ba8ffcb466f4bf SHA-256: bbda701baa5a840ba3776ea57622275ef02d5f9662fcec7bcbac782412d20a89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs, despite some being marked benign, are part of a broader pattern of redirection, suggesting an attempt to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160872a6014232---61105817515.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/68klecv6ia983ra2tocbqs81fu/23031518839.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c591f0249f2---38622408622.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96f29df5f---74500123671.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f8db1795---6240042070.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160813fb35d608---sezaxibebezomazusuji.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f0be3095---35713320958.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/46889890910.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qng4c0odqsei28h7em728no582/sedibabasurogerobusage.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160beb66b6afba---50701874103.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7926b6b6295908760bd315e31428802e/84604646465.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d7d2c2e5e---novaretoxujigodujuzemo.pdf
    • http://retco.ge/ckfinder/userfiles/files/77480476170.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf4081a5a---15619859228.pdf
    • http://prodottoitalia.eu/userfiles/files/mofuja.pdf
    • http://zulaikhatextile.com/userfiles/files/9401799813.pdf
    • http://botosani.ro/img/uploads/file/kexexisepuwejefisiw.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a013b4b210f---weponokivifedufupazemafu.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ceae5ab37---85189852889.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vtho6tcscurs2dvdcmubtm1bc0/13378691721.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b71264417---68378739496.pdf
    • https://airtelco.com/data/users/_/email/files/niges.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+american+gangster+full+movie+free
    • 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_off0000ec5f.bin
a5568e1eace5b72e8f8dd14964a73a297a3c233ebf55fb2db2a6883fcdff1589
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 10940 bytes
font_01_sfnt_off0001059b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 16792 bytes
font_02_sfnt_off00011dad.bin
8ac9d9e7748b0c80167a8bcb0357a424021a8c4ace47cd43b13761777e824138
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAD 17556 bytes