Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e52ae6aebadf92…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 13:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27bd68ee411266b2b42f81c6c4ec68fa SHA-1: 0e480293ac78490d244ea59fb4c870964ac76175 SHA-256: 43e52ae6aebadf92f02b0a3a108cbc274a881e398d63d275eef0f8c60ba81d0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

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 http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f199bec75---mebinelulufokalawuruw.pdf In PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/91141813829.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/15586109245.pdfIn PDF document text
    • https://edusfera.pl/upload/file/vilurinisenox.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/ruvixogo.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/82244278039.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64427882547.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/porej.pdfIn PDF document text
    • http://heureka-cz.eu/files/67618448959.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/29659225342.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/95094937338.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1128850061612ef17a078cf.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/gokedevagutitiropov.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/fenetunamuzit.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/baxudukiroz.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613952bcdeec8---82313725554.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/satelosomutov.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/50141314439.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f791b673d5---wotujeriketowuwu.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/59151940211.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/30768462924.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/38703699248.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/midixoxeja.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/39403490692.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/do7lkbgk1c7uno5ec5t5tda3u6/ruwoxovoxizufugadad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=reading+comprehension+esl+intermediate+pdfPDF 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_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 18272 bytes
SHA-256: 6bb901a2bf320034455d3f2a498b544872c5bb3bc0debc1b7cd2258aee4ad4f4
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 11112 bytes
SHA-256: 71fe75ddc53d3039863a0d2762787fb3611a6f767f408c87430f1ccad6de1b6e
font_02_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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