Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc07c40d27d7614…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 20:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 216f150147937713c0a7542bbbca60d7 SHA-1: 4d7bf10eda0b0089428fe318c3c1b9a858797ef0 SHA-256: 5fc07c40d27d7614ba73f1c86ff8ed182a32002d5cb08b7c44280ab73828fede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the nature of the embedded URLs and the PDF structure strongly implies an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://luligang.com/ckfinder/userfiles/files/19361127139.pdf In PDF document text
    • http://csc0516.com/userfiles/file/20210927172027_ozi349.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/67907866930.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab50844af---zokotogabozati.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d89a0832---31280435887.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/27ff40e1e1db7c39c8ef2c7d882df338/rapebadefefa.pdfIn PDF document text
    • http://protok.pro/upload/files/48673669366.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16156444a7943f---getija.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85646865381.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/54253697447.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/39604194087.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/22529169862.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/gesiripuxunoxafesu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/togopumifegubularamavomu.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/napuvopikudixujasi.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/22556996006.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/vepojasivexogiwabad.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///xozix.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210924000855.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/4147535240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+anime+pornPDF 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_off0000af78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF78 10224 bytes
SHA-256: 6844b594687de923a303074b48158132021a5b04d6b133d8d6e76b3fb1bf6067
font_01_sfnt_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 16108 bytes
SHA-256: b27ce5d5a222a327682dcbd27fd4e98c1a722dcc592d588bf5db7ba86290a55e
font_02_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1