Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7425b581dc9c00c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 02:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c0d99089aaf6bfb31b40c41f4b4c07b SHA-1: 9c578a31d40229059b15d275973543d37b711628 SHA-256: d7425b581dc9c00cfa6258f2dbb8be3dd1a5f5735e5df9b39df11f95664ab9a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=why+apple+is+better+than+android PDF link annotation
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/kowuvisidukekanivifa.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/foxuv.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/d66kspeb3e7b8vgp1em023gr3s/magufubiwekopek.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/16634828087.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/gizidumutabuzifesomaki.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/vstdtdk7kbotfmfvrsmrr3788p/rovakevuburugil.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/79080318739.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/59391013213.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/73632445587.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/82252768651.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/fegagejasukigivewikoroga.pdfIn PDF document text
    • https://hoalavender.net/upload/files/tixukafejunarovijifobuxix.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/86610859541.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/zosamigolip.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/fibosotaxeze.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/93140440291.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612e9934cf5ac---81919175358.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/baseji.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/34bb6451f1da39d93b20de95d5c3322e/nuvamejipaf.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/54941824147.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/4046587794.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/batupowetejirepo.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_off0000b3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BB 18316 bytes
SHA-256: ce10306c74033644bbc037b021d0de2afbec3e2cfae9e4535434f2c9b05d4ae9
font_01_sfnt_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 10736 bytes
SHA-256: 852744b18562822b24cd832487fee2e0ffa4e5a1ccd2104fa1cfaec68c2f42be
font_02_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1