Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e58e87b6c30176…

MALICIOUS

PDF

77.9 KB Created: 2021-08-23 05:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 923dfe08bf8dedc415c0edab59a46e23 SHA-1: 3b433f88e98959b44fc2517395ac8f97c7cdc74e SHA-256: 78e58e87b6c30176b1599e0d844e7563fa4131a7b08fd1331b6568bdb08c55e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs, many pointing to other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS upload directories suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://alarcon-v.com/editor_upload_image/file/40174475430.pdf In PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/aea44c8b7a70da3c2bf388af8e0dc503/depomidopesupazu.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/52054709765.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3219cf2eafcccdf33ed93f4303b0dfac/96784781133.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c929ea26c09---xetujegixoxisosesab.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/negom.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jhii8e38pqf6lit6gratdst49b/82160001460.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6586c1b147---gusubegatizowe.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/p4e3mg6vv4oa8s0tsv2ih757pq/pugofuduragexitevutifuvaf.pdfIn PDF document text
    • http://ahchala.com/img/file/36394818746.pdfIn PDF document text
    • http://teraval.cz/res/file/28128436725.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/76787170946.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/kujukavidetake.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4bdd933f14def69443883982abef8847/90588741603.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/zogekepiju.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/87652849176.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/66509565703.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/teminofuriditagox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9f75790de---lezumotulafatovogijikelu.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/zezobexa.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/10320034815.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df82f913ad---45551375671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=motu+patlu+ki+cartoon+chahiye+videoPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/gisupajufudutijum.pdfIn 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://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_off0000cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE606 10808 bytes
SHA-256: 12d82b9e2d5e3232079deac9dbce0996d03188e1c5be5e40dd5152c0fd532499
font_02_sfnt_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 16488 bytes
SHA-256: 12c35d09dda5ef1acb92baae318ea49c50c616f39877a8fc06f67fe6b7a9703d

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