Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3522ce0f4cc43d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 07:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8c45794fa7c61b597d074d5ebc4f7e19 SHA-1: 8fcf736882d2070b382f59fa9b87ecb3615db1b1 SHA-256: 0b3522ce0f4cc43d7ec1bc34adecf86e2ce7280dccf15029ee6f3035d56f019a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20d685043---51268460134.pdf In PDF document text
    • http://soft-pro.hr/upload/datoteke/95179018811.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zerojiwewilonekirita.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/015d68ab81da92686a30aeb44e6471ea/3737736993.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/64660812990.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/sosodifebasuwoguzinovale.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210810005429.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/30004743800.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/12851738378.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf134334e---wesutefatonu.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/rubisekejiwefajikawoxesa.pdfIn PDF document text
    • http://mextro.de/upload/files/korotowaxafituxatumikuji.pdfIn PDF document text
    • http://peak-experience-japan.com/ruxebojofajonutos.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/lobidonotid.pdfIn PDF document text
    • http://health-bridge.in/upload/file/43297068278.pdfIn PDF document text
    • http://pi-consulting.ch/download/povixefasigizejosafo.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/67587590995.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c0f3e38fa---merep.pdfIn PDF document text
    • http://ducnhua.com/upload/files/dimepaname.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078af2b46cd8---lufoderogikefizuvekegep.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/7qs8rtuj0m9v5b7d95ps8m9736/43069639279.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/eaf686cf46d055b1b289359c73810348/pezowasakosozusa.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-26/20210526074226199108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=etea+paper+2019+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_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 17400 bytes
SHA-256: 9c6165b90f502c8b3ec803b5c8589c585a0a24d5375ea8eb460bcc9f793065e0
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 10408 bytes
SHA-256: c6f3b67b80ebcc7187ac1b0fb3a37d4d6ceda325aff35819528a2ffe078186aa
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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