Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1fdfa0942bac4c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 18:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec88e2941663cc2cf29d95d43e318f3d SHA-1: 0e22fb3d24e3503547b9de30c3ff74217a168148 SHA-256: ba1fdfa0942bac4ccb36347e63b8e4aca8de582d909bbcae044224bc7ece7e37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, some pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URIs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://siciny.eu/userfiles/file/bexanenobemisu.pdf In PDF document text
    • https://doluhosting.com/calisma2/files/uploads/jonagojade.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/wedaluvebetozekusipa.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c66376b66---bogaboremodizesem.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/zudidazilugikowegubitawab.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/80989226014.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/buxezufig.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/wifadusanenaw.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/84029636077.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/jopivovela.pdfIn PDF document text
    • http://landpas.pl/upload/file/midofarid.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/xofavalexejunesalata.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vegurixiwetat.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/92935635587.pdfIn PDF document text
    • https://esz.jp/img/editor/files/43768211209.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/65964631618.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/16780668018.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/duzekegulop.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/zujigajatifuzodorat.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/02d8132f9e45dc4fb64a8ee7c1c2a6af/rawadaras.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/31174292720.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/nutisegemuwuxutosoboko.pdfIn PDF document text
    • https://pellevah.com/upload/files/34044984193.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/lokuvonajeduvumuzu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f89a9c525f---94745205651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=shadow+fight+real+apkPDF 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_off0000b89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89D 15468 bytes
SHA-256: 1df855fb152b4c62200b76435bcb38bf2ab45930337d4308cf261e96f99323e4
font_01_sfnt_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 10756 bytes
SHA-256: 14032e7267605504ae682f6a09364841de23aaac3464282110391bd30d8327c2
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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