Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f6bf3c3cf43b90…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 02:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f08e10d328596a64c1eb74851be8bcf4 SHA-1: e245450fc6c04436baa5e0a007df7d1e9ac6b7cf SHA-256: a0f6bf3c3cf43b9019a1b81f99e02807d007816a5575d20a145c0e146ab8a082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were extracted, the PDF structure itself is designed to host and redirect to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://eichler-kammerer.de/78327175505.pdf In PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/56156836645.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4c7d6dcc6011038b636b831005ac7ed4/veragadeforetumupoxonux.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf5f0bcb9---xusiziledupikaduxinum.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/megepepiviludim.pdfIn PDF document text
    • http://budropol.de/Upload/file/deraf.pdfIn PDF document text
    • http://airzo.net/userData/board/file/10154762231.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/11856344944.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/zobukusiku.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/84010874743.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/pigoxafofemepubok.pdfIn PDF document text
    • http://venkateshservices.com/uploads/podiboxup.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/gavudekovukomifim.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf1a49c11---mitejizufosusapuda.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/bapepapesideso.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/67799935147.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/iqh4dtdv3msjsps6spt021p8th/bunaxorilidegasaj.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/20750765634.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/39582626011.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109062203536178.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/posiletejamilenagive.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/62212959760.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/39077805668.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/gokarufubak.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/guloronaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=schach+app+f%C3%BCr+android+und+iosPDF 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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 10808 bytes
SHA-256: 360a8a31e425f4f389fbc8cbb9a61c1548c315dee05240ab626a8d67e1938392
font_01_sfnt_off0000ec67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC67 19568 bytes
SHA-256: b3fe9a54e70435efcf18dc7b940add99dc17d20a4cf2efab0a885be561c83b77
font_02_sfnt_off00011dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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