Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79c024cac604c61…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 07:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebebf2f0d0f73ce6c44326279271d4cd SHA-1: 692d5b170ef0fc03db922c31144d237d55ce884d SHA-256: e79c024cac604c6188071ae06b60d95d077cff5896c5bfba3871193795b9fc6d
156 Risk Score

Malware Insights

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

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, with many URLs pointing to disposable hosting or compromised CMS uploads, designed to trick users into downloading further malicious content. The presence of numerous unknown URLs supports this phishing and download lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://minlinart.com/archive/upload/files/55696162131.pdf In PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/rusepiba.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4afcb1cf47fbd48709041008d0d9c826/valopenanegegufufanejerup.pdfIn PDF document text
    • https://onecre.com/images/content/files/55321825529.pdfIn PDF document text
    • http://isvpro.com/custom/files/11808465076.pdfIn PDF document text
    • http://dhf-china.com/d/files/25012638609.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/37083883935.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/53633031319.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/73616238175.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/diwedutonujumeg.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/77026754648.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/vazuxorudanatefarefunif.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/95001143142.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/5197244073.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/35221934840.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/52212287222.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a70437f2---lorugerosuku.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/20878990392.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/liwuxanokaletiwajo.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/vodujamuredobuwuwunegu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/21048227221.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/93354561252.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/27091394996.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc5040650---17940982279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mlbb+advanced+server+apk+downloadPDF 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_off0000aeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECA 16584 bytes
SHA-256: 3017c3dc009d95b15b1e903276a6ea61fb27c54b96219426ff5d677de598b0e5
font_01_sfnt_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 10692 bytes
SHA-256: 4f4d8b9bb39575c17e58254b1fa3711b0ec247eaa789d04766c22efb6b9b127a
font_02_sfnt_off0000f157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1