Malicious PDF — malware analysis report

Static analysis result for SHA-256 68673f5d2b7273bd…

MALICIOUS

PDF

86.1 KB Created: 2021-06-11 04:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ce0e014f60a19929373c45dc08b8aba SHA-1: ba9b5a4524d997eb5bea8d51ee66c5cecaefab4e SHA-256: 68673f5d2b7273bd7eea017ed610da7599d65a583ae0b15a1ad5ad3daa47f9e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=the+mummy+2017+tamil+dubbed+download PDF link annotation
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t2umc9ec5m0lr1fjsl0gn9jnd5/fepoza.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/nekorudodo.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622123900.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/63be5b00e2e23907eb794a548ffe9f3e/bodilejizegupusosolel.pdfIn PDF document text
    • https://aedwea.com/upload/foto/pubotoruromaxite.pdfIn PDF document text
    • http://metapolar.hu/tmp/pibezataxazagogesakibir.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607008954157a---katad.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5e89ea5dfacf7a348fd4f18fb05f3fb0/51779278886.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607344cf77208---jivuvufaj.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712fee4f5ce---77338379698.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/67828411760.pdfIn PDF document text
    • http://bakoca.hu/files/file/kirugalegumewatulolidit.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b482748accf---zojujosalavimimalowetuloj.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nh49bjmksnu4tpenufokdmil42/87630298839.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/65235611287.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdaae518ad---tufukugomagepowejexokasud.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff59495377---12723605557.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/54393332975.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010178.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10178 14248 bytes
SHA-256: 5a00ef85de47aa081051889a5a584167bf3f8d353da357e2806e30f3d4adda26
font_00_sfnt_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 5480 bytes
SHA-256: 90061183108608ce40930957e00c86dd5857f79132d15436ba42e4a7f5db4d6c
font_03_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 11236 bytes
SHA-256: 8ebaf38dedac8f2c67d8465e980f26b838ac8e1e7c487fc64287723efccb7c88

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