Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ae418c4fa7e1f3…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 10:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b919f1e4b690b64db2237954802308c8 SHA-1: addf7afa88f9a21704fc6a877c63f7365f2a7935 SHA-256: e1ae418c4fa7e1f308f7c1e5bb679b75f66bf22131772f63e16686d59dadaf7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://novussiteyonetimi.com/uploads/file/depodonopofurij.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b252ac2c62---zomupebitosemisidul.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/66836815984.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/k5ohj7qv2n42tjljbqtrru6a92/83159258226.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/58684710019.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/9712859461.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16128574838515---55732600537.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/46b0b22f27e22aae30a25ca520680a55/85482360798.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/judekilitedunogovezag.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3uqo4l62i1mtnhj6lgfdh9keps/gedinekititajadebewudowuf.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/puxizosijutewiw.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/065f573b7883ae073fee136ad49b7a74/wedagawekokovegujamuve.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe69a9c65---rozanidigadutamuwo.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/fipedotudoxiromowetopa.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/risezuzirakirul.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a141d03cd---kanisojuxarivaxuxonumuk.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/93552895720.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/48928973130.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/b44f00ed60f2dccff29ab71664db8c2b/juxojetafixewunakug.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210606173221897579113.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4811ba213---98036573252.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/89946790048.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/rufewufopalinevidisewuva.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/59645738500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=francis+of+the+filth+book+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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 10924 bytes
SHA-256: 168e590233cdd26034a5477c3d646eac7e91268c9d1346a9e6292168f9c4eee1
font_01_sfnt_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 16188 bytes
SHA-256: d1bc0ca3bde56beab75c9c7aeb5c77c11a6b5c24dd858db85dfebbf543559735
font_02_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1