Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5bf853a3e38170…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 19:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1723aedd7c88950be51c03298b0bfffb SHA-1: b8245c8707505ec4c4c37b9571330fa3cee49dea SHA-256: fd5bf853a3e3817064983a68b4110a26ded0e66e0ca5c616e852dad90a112e14
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://hotelexpert.ro/uploads/files/33839901821.pdf
    • http://akekaluck.com/ckfinder/userfiles/files/83814853490.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1611717a050777---raboritafejatekes.pdf
    • http://accessiblevehicleservices.com/userfiles/file/51964429606.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0482fc7cb4---nakarutibat.pdf
    • http://aftckwt.com/uploads/file/pixelajeludi.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161198b8de0182---guzebezakejadebufujibozot.pdf
    • http://tetobox-budapest.hu/uploads/files/jemazezezasonozefafezalu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607024781dffd---12353763936.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073dbb0ac933---moxeboxawofetuluzupelidan.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bd978e2cc2b96a15074927b40854e57/bivakuzuxetulizojajot.pdf
    • https://vvpta-irvine.org/userfiles/file/25180800950.pdf
    • http://buddhavehicle.com/userfiles/file/42320893582.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/802302c8e5ee9f2f38e2f82676400650/girexo.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad5c1502b---lirudorajobujivif.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vuwitudebavupit.pdf
    • http://ambulanceservice.pl/userfiles/file/69503919376.pdf
    • https://sofupingame.net/calisma2/files/uploads/56304599009.pdf
    • http://lycee-elm.org/userfiles/file/44520035457.pdf
    • http://amdind.com/userfiles/file/xefisofidox.pdf
    • https://jurad.eu/files/file/busin.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b647591fe22---dupaz.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b11540be3ca---ruzobigidiguzene.pdf
    • http://imosa.asia/uploads/files/202108192008279428.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=levels+of+government+canada+worksheet
    • 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_off0000bfc6.bin
41aa2045c0f2029640b602e278424586ef7d89a757a050b1ff218c3501ce6463
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC6 16780 bytes
font_01_sfnt_off0000eb1f.bin
bd5059f9371fec660fa4c1b5dee05b65ee9e43acfc96d9f9316f767aeed9fbfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 11032 bytes
font_02_sfnt_off00010489.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10489 16792 bytes