Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7026277de98178…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 06:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45b0afa747898f9e96b44944d7ace890 SHA-1: a894ade1760b84a348686161178aded694861283 SHA-256: 6c7026277de98178b36f0ad4f61e44e709023ac70609019b3ecebaeaa57897f0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various disposable hosting sites, likely intended to trick users into downloading further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://qdxqw.com/uploadfile/file/51847259655.pdf In PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/leramululozur.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d54896d5b89c82befb71f2989060436b/fuxawukep.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/bamolukug.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/44357177061.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b9f9c7f1---jujumesikizoravanibopu.pdfIn PDF document text
    • https://titishop.co/upload/files/zolaxaligagasizavipewuvas.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/jaxapobivofugoripu.pdfIn PDF document text
    • http://imbirimbir.ru/files/bekoxujuzaval.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/22630051461.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/lusekekofowapatifiwowelu.pdfIn PDF document text
    • http://grafitym.kz/files/file/bivixijopiwajobumadid.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/gesosumuva.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/samavefo.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/jemafit.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/zezexusabozotujajudibatu.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/27024446843.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/rizuf.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ec5eedf9e368fa3f3f99c33e94add839/60686955178.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/tivateganuwabuni.pdfIn PDF document text
    • http://ingore.cn/upload/files/92122266429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pet+alliance+2+mod+apkPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bca47a100---52165109269.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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 20304 bytes
SHA-256: ff550bc4d44732f3bfee36ae78183abe733b6980ec8aff0a89e1b874503b2927
font_02_sfnt_off000123b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B7 10620 bytes
SHA-256: d2e7f6d8dcb6cacb5e2a981eb3de08cbaed3ebf794e0182e4073895585e51fbc

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