Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fbe1c38eaa187e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 01:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d6e85cc6309cae03ad66e8258e494e0 SHA-1: 278577315156818d2f93b40b6699ca9520d00ff2 SHA-256: a9fbe1c38eaa187e863c9ea18573706f99a6d3d9558ca7312f9ca7da0977b81e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aqualibramontois.be/fckdownload/file/11096766894.pdf In PDF document text
    • https://pchome.uzai.ca/upload/files/tivuvodesebusifono.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614557401e39d---farepobefugipojesaton.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bac1d0750---nogulajagazerugof.pdfIn PDF document text
    • http://mdcegy.com/app/webroot/img/fck/file/60246719534.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/af33ec4828627c647097335e8b279ed1/88010653351.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/bakolixawutewadodivibofi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zitilesogalubuwutof.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/58178474752.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/76937699199.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/90601782548.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/rixirosuborezuguri.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/juwijimuromop.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/59080488735.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/womexada.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/zitororuzipibojekazideso.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/279544552.pdfIn PDF document text
    • http://cssh.es/img/file/10395132928.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/86049658377.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/90883026283.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/2745185577.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/tegasokokeneva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=torrz+play+storePDF 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_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 17676 bytes
SHA-256: 5d66725c604109a56445e618f451b05f488349161046028a98b47cbc5742e792
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 10184 bytes
SHA-256: 765398bc7cc0cdeb7bbaa0b61fa6ffb9eb183fa385d8d54ecd1a99e5c2a39582
font_02_sfnt_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1