Malicious PDF — malware analysis report

Static analysis result for SHA-256 c916ada4d0fbb3c5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 00:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09f22ce06c336748401bf30e7da47dc7 SHA-1: eb0293a651d848522cc05ce79f729e7a9b259815 SHA-256: c916ada4d0fbb3c503c73c4120fa0e0725715cf6ee5b73b1037591cd9f1524fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://festival.bg/fckeditorfiles/file/repogazuvox.pdf In PDF document text
    • http://superazs.ru/images/news/file/74088767660.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/47459830225.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7eblot36se4cp6r8gffaqjdu41/70873816003.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd29790dd---lurifuzegofovi.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/jupixomezamukadepafezut.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/nefifazutipesabubapixigo.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/71451820187.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/tepibiwanezufefijisur.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/zosotawedidamepawolipi.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/3292392280.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/guwabopuzatobizowovasep.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085d581e4edf---24403414414.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/32821805547.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072466e56ce7---xofizuvofawufagepekoto.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/tisiwekeruzigebonojis.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/xelapuxitavu.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xigelidizofirexa.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/d3qrmuesb103gfugfqvb2tqitm/vumokewefenixo.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/31720878506.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/fekararapibisuxifelubemes.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/928172ce7ee2b3dfed993df1b476d4fe/femaxeted.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/66885908074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cornelsen+grammatik+aktiv+a1-b1+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_off0000c5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 11256 bytes
SHA-256: 863a4e7b67d41d94efcae936edc456612d24abc24b81ad71936e2f9b6b079efe
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 21276 bytes
SHA-256: 1bde60890327ce25f0b8815792887373f8365a9f0deb1e76cbd3b8bce6ccce50
font_02_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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