Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebf42d11c9c9e703…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 00:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e70239421913f7e7414a99f75d82858 SHA-1: 1c38c99366ab294dd4952356b1aa20e96b079f1f SHA-256: ebf42d11c9c9e70379ebfa789a14efdf764a1df89735e6c06652cd7e1a6c8aa0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://laughteronlineuniversity.com/images/upload/files/62094548441.pdf In PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/28763757920.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/jjiv0e5kn3sh80h6q5r68571l5/77593668115.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bc8930f5fb38c5a6dc4ee628ac17e3fa/1108013146.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/82256247684.pdfIn PDF document text
    • https://grouptm2.com/contents/files/25121568830.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210911053051009.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/53218313887.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/malobigezusixogi.pdfIn PDF document text
    • http://toonesk.com/upload/5918478680.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/11734832623.pdfIn PDF document text
    • http://greenbrier101.com/userimages/rosere.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/18274308214.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210902_97A91D35A92AF0AB.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/7823779787.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/30682101062.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/vategixedonumatilevewumif.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/21883046683.pdfIn PDF document text
    • https://majubesar.net/contents/files/rixejin.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/99808716801.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/67975987837.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/317c11b4de4ae3fee0eaf85d6f38c7d5/bafosil.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/48866989937.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6de722c20---11636556591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=live+chat+mod+apk+unlimited+coinsPDF 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_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 10892 bytes
SHA-256: 34e89e53a823a079f66eb3e5b64e010f8f391ab7dddc8dc189a12adaba98bc90
font_01_sfnt_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 17024 bytes
SHA-256: 6f293b31724277d3360e52c134b0d6be02c6f6aa469b55baaf9646c605ddce85
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1