Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b4bece1fed1342…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 04:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a08241752b49c5fbeab82ca27c6c7b7a SHA-1: 1a6d35ce8d608eabc3ea4cbb02cbc524094e1326 SHA-256: a9b4bece1fed1342cd2e8d0105966aca2d48a9323bd8b643d90b97c62bce1aa7
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 disposable hosting sites, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple compromised CMS upload links and SEO link farm heuristics further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yh-nutri.com/filespath/files/20210905135726.pdf In PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/a8q2f065tpdkajlpap5uojl92b/padud.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/lekoposaloxokabolugapeson.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/53126353243.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/93738835835.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2880b2af6b---5498896308.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/18103567406.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/8cc53a8aa578404f82a2d5d62b781842/kuvoneledujelojikinij.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bj3a9fargmlajonphaf77tpcgn/75831691465.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9127d262---wetusovebufanaja.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/89f7f1e8dd53e6101598d394ef6d5f2c/98694307559.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b7e88a970---fosigi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zogefomesimorif.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9ovgeggt1p4sdpedt4eldnung6/77137012173.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/makad.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fd71ddad317ba46365c4052458ad7321/vifusisuferam.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611836263fb94---kipemu.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/32697584531.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/noxeliduvonobegefadotafo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/579ded3b5145fa617b4e35ee4b41815c/12710747097.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4790dd9a3---zefubas.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/rugetokajebabepowarafiw.pdfIn PDF document text
    • https://maviet.vn/upload/files/zosiwikozugetasawekilan.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0b36a144---7771722000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=manual+de+usuario+word+pdfPDF 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_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 10572 bytes
SHA-256: db407078083c2a4f7f6e6d9533ec143c299c449ff026bf554f52b792e38cf50f
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 18120 bytes
SHA-256: 21e40d4d2eac661fffeec5be58a98c4c69de5943c52468fca8fe443699dbd0e2

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