Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9325082d0698013…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 07:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfc7316c5e9389cf89300ee6e3b99225 SHA-1: acaac7e1a5f76c4b4fb1055e3013d8ec44376606 SHA-256: c9325082d0698013f1f24bbc0525beec1e3095113c31dcd8ee73daac0397b514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://architettomontanino.eu/userfiles/files/kezatukafolowazuj.pdf In PDF document text
    • https://viceda.com/userfiles/file/buwulezenor.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210918_101020.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/33972477134.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109280316448779.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/18047253901.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/18992221035.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/rubewulax.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/gigivomava.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/39765072230.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/xulawanofux.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/80225054984.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/75442257582.pdfIn PDF document text
    • http://scantech3d.com/files/82225829188.pdfIn PDF document text
    • https://vpmemorial.net/images/file/debogijegew.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921afe4b74---mujibedugunivala.pdfIn PDF document text
    • http://tajilin.com/upload/files/85997090102.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613334d962bf4---fetidogegadepetunib.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/3097559029.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e9d5e1da0---73987267808.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141af6b43ef0---84425015186.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161321265f20d7---vawupenotono.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/rusodajuziratumupaxafur.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/tujurij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=difference+between+parenchyma+collenchyma+sclerenchymaPDF 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_off0000afe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 11088 bytes
SHA-256: 3995f3d7196642df18eb0770e9ffdd777c7db760a02c92d8917b0054f7cec22f
font_02_sfnt_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 14380 bytes
SHA-256: c88471901fc898a244525540994d3411930af2d45e67962a21084be52babd069

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