Malicious PDF — malware analysis report

Static analysis result for SHA-256 475c0ab03bd76cb5…

MALICIOUS

PDF

75.6 KB Created: 2021-07-10 02:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cf59be9fe927a1064d40219b935cd43a SHA-1: 683adffc3fb1499ff47f7df76b47e50457446138 SHA-256: 475c0ab03bd76cb51b489d278543d49b44b719fc38918c8b4a171359e27cdad0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm heuristic, indicating it directs users to multiple external websites. Several of these URLs point to compromised CMS upload directories, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jingchengs.com/jingchengs/ckfinder/files/20210704034621.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925a51689be---saparatofuwizaketererog.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53b5c1eb7---5720358612.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/79563463886.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c94a2130d8e81c23c9a0a35af941506b/gilaz.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160e35403544ac---89428259582.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072004c6e273---roxagefujoxabanewar.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/webipovorenunomosu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/gajunisevavebadid.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c96003c960e---60061066776.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/84643385456.pdfIn PDF document text
    • https://norservis.cz/files/files/304875706.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/mudofizonegi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fce6a1220a---58343986614.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/64031666468.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pesih8n66d6gm3krc7lnl4582b/65031701872.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/la918skmc9gejjb3aak1u6llt4/25236118525.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76358bd9fb---fovosax.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/359c58db0b861af16f94fe588f93132d/xamojipumutefozunu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/fd72c78d2f53e23b246a1bbe91558973/suripafupos.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lpl45ai7uas1a5ifoulvtlulbl/89769145170.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af8a5e376---18431091346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=easy+way+to+remember+piano+notesPDF 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_off0000c608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC608 16436 bytes
SHA-256: 81c22545507a9eb368d503a20f0f479163a6c3d77f1a558ceae4614f8f57f0d8
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10692 bytes
SHA-256: 8ab81c2de0f0c3d6c219cef4562e7f6b8b69991d5d1625d230786176bd2f4e6f
font_02_sfnt_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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