Malicious PDF — malware analysis report

Static analysis result for SHA-256 c384fb760e73a73e…

MALICIOUS

PDF

107.4 KB Created: 2021-08-14 05:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b0ebc53d8eaaf1f70cb2dc33e8f46f9e SHA-1: f0db128082e8b59f798245a9502d32d87e0f0180 SHA-256: c384fb760e73a73eb85b8431c8ae11d974f4f392707238cd0d5b995fdd5bf1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://botosani.ro/img/uploads/file/67463432347.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8230c1748---51049443515.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f448e2c59081248b91c3162fa2155c9e/39938326791.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16082e787cc22c---70055914661.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/47cebb6f164e18d9fc5aa4b19adf43c6/10825283805.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f08f1a889---46031116514.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/punitojekolanutazuguwem.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ca627f8f73dcff4d8d3f86df9e72008b/bitanu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076751528e69---ponutozimajagiza.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/95938846346.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e7c864843d288c4db41a0884bfc4527/48689658468.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/42149231780.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/57954223715.pdfIn PDF document text
    • http://poultech.net/d/files/tafutadaweka.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4328f08180---62789131148.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7f108fa0a---79304276903.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670f39e4ea---podigugubasoputepelofiwod.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071408eac144---63417654231.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/cb0303baab6ca058fd439259df8b753d/lumeguta.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/nitixoverirefun.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848c4fd6fd6---67595065460.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/vomidesowibe.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ea43289cffe146584e67b823feb33933/3949434211.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/rupetigidujavif.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/712fdaa6b07e87da97dc598ea2d772a9/11752829600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sony+vegas+pro+effects+pack+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13791 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f
font_02_sfnt_off00014d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D74 21796 bytes
SHA-256: c801148c4c35110c3f9215bb31cf6d1074575affbb785d13a81aa847a230cb71
font_03_sfnt_off00018486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18486 11136 bytes
SHA-256: 0aed3d7050a04594b0341c2a4942ec77fbac1ae9538f6b2c30b1b29a7ddecb41