Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbfab410c8ef9f5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 08:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 919f215108292c1fb47efb9f8f620311 SHA-1: 88e904ce734febcc55fdc3e90678f01cddb76cfc SHA-256: bcbfab410c8ef9f51c89d6a820a440cf83d5af0effe1a2de20945d4221ead71c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=comparison+of+adjectives+worksheet+pdf PDF link annotation
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/xojapogubiwabamuta.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/samaxokoruxukoxuroruzo.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/xoxazeki.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/71b07889a56e6ae2aab0e088c4f0811b/gedovomobudazodezeseta.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/gumomuwobo.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-17/20210917131716669853.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/19633930004.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/9bd402b71f894c34d4d943df680a42b7/deximuv.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/simake.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/9352341929.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/54872469238.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/jawisoxewevebudalugifatix.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/defitupezodetanaga.pdfIn PDF document text
    • https://ptogel1.com/contents/files/xatapabagevepuvetu.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/32663462303.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/21107160320.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/95346224756.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ccf474288---86015054875.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325475b1f8e---gewuverakevetinuk.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/20292761222.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/nafimoda.pdfIn PDF document text
    • https://grandegroup.net/files/55641179159.pdfIn PDF document text
    • 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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 11244 bytes
SHA-256: f485f96ebe481d1b4e62d89ad2550b13b642a4c75070edb5a936379e1ae2352d
font_01_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 17448 bytes
SHA-256: e7a68ab8fc55404bc51297e7b1da20718b958734d0a5175f9d75ccfe23d88ec9
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1