Malicious PDF — malware analysis report

Static analysis result for SHA-256 8674394be21fc228…

MALICIOUS

PDF

87.4 KB Created: 2021-08-21 03:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: fd65af8cc5a25c8dc671bac28b6f294b SHA-1: 8e3513acc8e4e80eeb9415713542d25ec89f0d8e SHA-256: 8674394be21fc2285630c3eb4d0e24974c0332e8eaebcad385abdeb001c61892
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 0.9971

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://angelescare.com/userfiles/file/bibivafib.pdf In PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d3aadb9bfb---rezuruvuxubedat.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/satuxujo.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/32008610823.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/32473703741.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082559a4d75d---80220394927.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/67568592035.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/5oscb91rvvh5ke4gq5ufh9s623/gujajejavadevogozo.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/selekiboza.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd057a21a70---95861618672.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/lilupejaratoparolu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c10dd2961da4440e3b150bf1b74de58e/77021177034.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/65855833436.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/zujasi.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/dd91413c1c0fc6cfa8d18d6613cc2417/47659349571.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///39272270028.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b250ad56f514495df5cbe393e1a743c5/zakati.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/58020864996.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/45142506613.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8d27d96c8bcb375a5a2fa2acd41f2d49/nulol.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/wawovevideme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=earn+real+money+playing+free+gamesPDF 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_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 20164 bytes
SHA-256: 300ca8b0029205f7f95aaff85da008dde6db21b441589899605fe1d89486f741
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00011d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13542 10700 bytes
SHA-256: fdb3e2d0a026acd4e18ba1e112973f50f56c7a67f7e11393d42d392fb692a2be

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